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train/3100 | Which country is highlighted? | [
"Solomon Islands",
"Tonga",
"the Marshall Islands",
"Samoa"
] | 2 | closed choice | grade6 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is the Marshall Islands.
Does the Marshall Islands have any territorial disputes?
The Marshall Islands claims to own Wake Island, which is a disputed territory. In other words, multiple countries or groups claim that the area rightfully belongs to them.
The United States claimed Wake Island in 1899 and has... | ||
train/3101 | Does this passage describe the weather or the climate? | [
"weather",
"climate"
] | 1 | Figure: Death Valley.
Death Valley is a desert in eastern California. It is one of the hottest places in North America.
Hint: Weather is what the atmosphere is like at a certain place and time. Climate is the pattern of weather in a certain place. | closed choice | grade4 | natural science | earth-science | Weather and climate | Weather and climate around the world | The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere.
Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day.
Climate is the pattern of ... | Read the passage carefully.
Death Valley is a desert in eastern California. It is one of the hottest places in North America.
The underlined part of the passage tells you about the usual temperature pattern in Death Valley. This passage does not describe what the weather is like on a particular day. So, this passage de... |
train/3102 | Which solution has a higher concentration of yellow particles? | [
"Solution B",
"neither; their concentrations are the same",
"Solution A"
] | 2 | The diagram below is a model of two solutions. Each yellow ball represents one particle of solute. | closed choice | grade7 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the yellow particles represent the solute. To figure out which solution has a higher concentration of yellow particles, look at both the number of yellow particles and the volume of the solvent in each container.
Use the concentration formula to find the number of yellow particles per mill... |
train/3103 | Which property do these four objects have in common? | [
"fragile",
"transparent",
"opaque"
] | 0 | Select the best answer. | closed choice | grade5 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects... | Look at each object.
For each object, decide if it has that property.
An opaque object does not let light through. The ceramic mug is opaque, but the window, the fish bowl, and the glass flask are not.
A fragile object will break into pieces if you drop it. All four objects are fragile.
You can see clearly through a tr... |
train/3104 | Which bird's beak is also adapted to crack large, hard nuts? | [
"Alexandrine parakeet",
"spotted dove"
] | 0 | Hyacinth macaws live in the rain forests of South America. They eat large seeds and nuts. The shape of the 's beak is adapted to crack open large, hard nuts.
Figure: hyacinth macaw. | closed choice | grade3 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat easily. ... | Look at the picture of the hyacinth macaw.
The hyacinth macaw has a thick hooked beak. Its beak is adapted to crack large, hard nuts. The hyacinth macaw uses its thick beak to crack the shell of a nut by squeezing it. The hooked shape of the beak can help the bird hold the nut in place while cracking it.
Now look at ea... |
train/3105 | Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is smaller in Pair 1.",
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is smaller in Pair 2."
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different shapes. | closed choice | grade6 | natural science | physics | Velocity, acceleration, and forces | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets,... | The magnets in Pair 2 attract. The magnets in Pair 1 repel. But whether the magnets attract or repel affects only the direction of the magnetic force. It does not affect the magnitude of the magnetic force.
Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magni... |
train/3106 | Which statement describes the Kaeng Krachan National Park ecosystem? | [
"It has soil that is rich in nutrients.",
"It has year-round rain and warm temperatures.",
"It has only a few types of organisms."
] | 1 | Figure: Kaeng Krachan National Park.
Kaeng Krachan National Park is a tropical rain forest ecosystem in western Thailand. It is Thailand's largest national park and has many animals, including elephants. | closed choice | grade8 | natural science | biology | Ecosystems | Describe ecosystems | An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment.
There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which terrestri... | A tropical rain forest is a type of ecosystem. Tropical rain forests have the following features: year-round rain and warm temperatures, soil that is poor in nutrients, and many different types of organisms. So, the following statement describes the Kaeng Krachan National Park ecosystem: year-round rain and warm temper... |
train/3107 | Select the mammal below. | [
"kangaroo",
"loon",
"great crested newt",
"poison dart frog"
] | 0 | Mammals have hair or fur and feed their young milk.
Mammals are warm-blooded. Warm-blooded animals can control their body temperature.
A koala is an example of a mammal. | closed choice | grade4 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification.
Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals. | A kangaroo is a mammal. It has fur and feeds its young milk.
Kangaroos hop to move around. They use their large tails for balance while hopping.
A loon is a bird. It has feathers, two wings, and a beak.
Loons usually live near lakes. They dive in the water to hunt for food.
A great crested newt is an amphibian. It has ... |
train/3108 | Will these magnets attract or repel each other? | [
"attract",
"repel"
] | 0 | Two magnets are placed as shown. | closed choice | grade4 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles: north and south.
Here are some examples of magnets. The no... | To predict if these magnets will attract or repel, look at which poles are closest to each other.
The north pole of one magnet is closest to the south pole of the other magnet. Opposite poles attract. So, these magnets will attract each other. |
train/3109 | Complete the sentence.
The Juan de Fuca Ridge formed at a () boundary. | [
"convergent",
"divergent",
"transform"
] | 1 | Read the passage and look at the picture.
The Juan de Fuca Ridge is a mid-ocean ridge located off the coast of Washington State and southern Canada. This ridge grows as the Pacific Plate and the Juan de Fuca Plate move away from each other. The Juan de Fuca Ridge contains many hydrothermal vents, where hot water spews ... | closed choice | grade8 | natural science | earth-science | Plate tectonics | Describe tectonic plate boundaries around the world | The outer layer of Earth is broken up into many pieces called tectonic plates, or simply plates. The breaks between plates are called plate boundaries. Plate boundaries are classified by the way the plates are moving relative to each other:
At a transform boundary, two plates are sliding past each other.
At a convergen... | To figure out what type of plate boundary formed the Juan de Fuca Ridge, you need to know how the tectonic plates interacted. To find this out, read the passage carefully.
The Juan de Fuca Ridge is a mid-ocean ridge located off the coast of Washington State and southern Canada. This ridge grows as the Pacific Plate and... |
train/3110 | What is the capital of Oregon? | [
"Portland",
"Salem",
"Phoenix",
"Cheyenne"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify the 50 state capitals | Salem is the capital of Oregon. | ||
train/3111 | What is the capital of Washington? | [
"Olympia",
"Spokane",
"Seattle",
"Salt Lake City"
] | 0 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the West | Olympia is the capital of Washington. | ||
train/3112 | Which of the following organisms is the primary consumer in this food web? | [
"snowy owl",
"brown lemming",
"bear sedge"
] | 1 | Below is a food web from a tundra ecosystem in Nunavut, a territory in Northern Canada.
A food web models how the matter eaten by organisms moves through an ecosystem. The arrows in a food web represent how matter moves between organisms in an ecosystem. | closed choice | grade6 | natural science | biology | Ecological interactions | Interpret food webs I | A food web is a model.
A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web sho... | Primary consumers eat producers. So, in a food web, primary consumers have arrows pointing to them from producers.
The barren-ground caribou has an arrow pointing to it from the lichen. The lichen is a producer, so the barren-ground caribou is a primary consumer.
The brown lemming has arrows pointing to it from the bil... |
train/3113 | What is the capital of Minnesota? | [
"Indianapolis",
"Minneapolis",
"Saint Paul",
"Providence"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Midwest | Saint Paul is the capital of Minnesota. | ||
train/3114 | Will these magnets attract or repel each other? | [
"repel",
"attract"
] | 1 | Two magnets are placed as shown.
Hint: Magnets that attract pull together. Magnets that repel push apart. | closed choice | grade2 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south.
Here are some examples of magnets.... | Will these magnets attract or repel? To find out, look at which poles are closest to each other.
The north pole of one magnet is closest to the south pole of the other magnet. Poles that are different attract. So, these magnets will attract each other. |
train/3115 | Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is greater in Pair 2.",
"The magnitude of the magnetic force is greater in Pair 1.",
"The magnitude of the magnetic force is the same in both pairs."
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade5 | natural science | physics | Magnets | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets,... | Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are the same as in Pair 2. The distance between the magnets is also the same.
So, the magnitude of the magnetic force is the same in both pairs. |
train/3116 | Is a rock a solid, a liquid, or a gas? | [
"a gas",
"a solid",
"a liquid"
] | 1 | closed choice | grade2 | natural science | physics | States of matter | Classify matter as solid, liquid, or gas | Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a shape of its own.
Some solids can be bent or broken easily. Others are hard to bend or break.
A glass cup is a solid. A sock is also a solid.
When matter i... | A rock is a solid. A solid has a size and shape of its own.
Rocks come in many different sizes. | |
train/3117 | Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"sample A",
"sample B",
"neither; the samples have the same temperature"
] | 0 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade7 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | Each particle in sample A has more mass than each particle in sample B. The particles in sample A also have a higher average speed than the particles in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B.
Because the particles in sample A have the higher average ... |
train/3118 | Which of the following was an independent variable in this experiment? | [
"the amount of time it took to reach the bottom of the hill",
"the weight of the wheels"
] | 1 | The passage below describes an experiment. Read the passage and think about the variables that are described.
Audrey was building a wooden race car. She could choose between two types of wheels for the car. Each of these wheels was ten inches in diameter, but one type was heavier than the other. Audrey was curious if ... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify independent and dependent variables | Experiments have variables, or parts that change. You can design an experiment to find out how one variable affects another variable. For example, imagine that you want to find out if fertilizer affects the number of tomatoes a tomato plant grows. To answer this question, you decide to set up two equal groups of tomato... | |
train/3119 | Which animal is also adapted to be camouflaged in a sandy desert? | [
"flat-tail horned lizard",
"lichen katydid"
] | 0 | Fennec foxes live in the Sahara Desert of Africa. The is adapted to be camouflaged in a sandy desert.
Figure: fennec fox. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal... | Look at the picture of the fennec fox.
The fennec fox has sand-colored fur covering its skin. It is adapted to be camouflaged in a sandy desert. The word camouflage means to blend in.
Now look at each animal. Figure out which animal has a similar adaptation.
The flat-tail horned lizard has sand-colored scales covering ... |
train/3120 | Which of these states is farthest south? | [
"Montana",
"Nevada",
"Nebraska",
"Maine"
] | 1 | closed choice | grade2 | social science | geography | Geography | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the south arrow is pointing. Nevada is farthest south. | |
train/3121 | Identify the question that Alana's experiment can best answer. | [
"Are eggs more likely to float in fresh water or salty water?",
"Does the amount of water in a glass affect whether eggs sink or float in the water?"
] | 0 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Alana poured four ounces of water into each of six glasses. Alana dissolved one tablespoon of salt in each of three glasses, and did not add salt to the other three. Then, Alana placed an egg in one glass and observed i... | closed choice | grade8 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was gr... | |
train/3122 | What is the capital of Hawaii? | [
"Phoenix",
"Honolulu",
"Juneau",
"Frankfort"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify the 50 state capitals | Honolulu is the capital of Hawaii. | ||
train/3123 | In this food web, which organism contains matter that eventually moves to the parasol fungus? | [
"black racer",
"silver maple",
"gray fox"
] | 1 | Below is a food web from Shenandoah National Park, a forest ecosystem in Virginia.
A food web models how the matter eaten by organisms moves through an ecosystem. The arrows in a food web represent how matter moves between organisms in an ecosystem. | closed choice | grade8 | natural science | biology | Ecological interactions | Interpret food webs II | A food web is a model.
A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web sho... | Use the arrows to follow how matter moves through this food web. For each answer choice, try to find a path of arrows to the parasol fungus.There is one path matter can take from the silver maple to the parasol fungus: silver maple->beaver->black bear->parasol fungus. gray fox. There are two arrows pointing from the gr... |
train/3124 | Which of these states is farthest west? | [
"Wisconsin",
"Rhode Island",
"Texas",
"Montana"
] | 3 | closed choice | grade5 | social science | geography | Maps | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Montana is farthest west. | |
train/3125 | What is the name of the colony shown? | [
"New York",
"North Carolina",
"New Jersey",
"South Carolina"
] | 1 | closed choice | grade4 | social science | us-history | English colonies in North America | Identify the Thirteen Colonies | The colony is North Carolina. | ||
train/3126 | Which continent was involved in the Seven Years' War? | [
"Australia",
"South America"
] | 1 | The French and Indian War took place in North America in the 1750s and 1760s. That war was part of a much larger conflict known as the Seven Years' War. The map below highlights the countries and territories that fought in the Seven Years' War. Use the map to answer the question below. | closed choice | grade8 | social science | us-history | The American Revolution | Causes of the American Revolution: the French and Indian War | Look at the map.
The map shows that the conflict involved countries and territories throughout Europe, South America, Africa, Asia, and North America. The only continents not involved were Australia, where no Europeans had settled, and Antarctica, where no humans lived.
The French and Indian War was part of a global wa... | |
train/3127 | Which of the following could Ruth and Alexandra's test show? | [
"if the concrete from each batch took the same amount of time to dry",
"if a new batch of concrete was firm enough to use"
] | 1 | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design.
The passage below describes how the engineering-design process was used to test a solution to a problem. Read the passage. Then answer the ques... | closed choice | grade6 | natural science | science-and-engineering-practices | Engineering practices | Evaluate tests of engineering-design solutions | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to design a... | |
train/3128 | Identify the question that Devin's experiment can best answer. | [
"Can pennies hold more drops of pure water or water mixed with hand soap?",
"Can pennies hold more drops of water mixed with dish soap or water mixed with hand soap?"
] | 0 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Devin used a dropper to put equal-sized drops of pure water, one at a time, onto a penny. The drops stayed together and formed a dome on the penny's surface. Devin recorded the number of drops he could add before the wa... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was gr... | |
train/3129 | Which animal's mouth is also adapted to get insects out of burrows? | [
"proboscis monkey",
"tamandua"
] | 1 | Aardvarks eat insects such as ants and termites. These insects often live in holes called burrows. The 's mouth is adapted to get insects out of burrows.
Figure: aardvark. | closed choice | grade4 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear ... | Look at the picture of the aardvark.
A tube-shaped snout helps the aardvark reach into a burrow. A long, sticky tongue helps it catch the insects.
Now look at each animal. Figure out which animal has a similar adaptation.
The tamandua has a tube-shaped snout and a long, sticky tongue. Its mouth is adapted to eat insect... |
train/3130 | Which is the main persuasive appeal used in this ad? | [
"ethos (character)",
"logos (reason)",
"pathos (emotion)"
] | 0 | closed choice | grade7 | language science | writing-strategies | Persuasive strategies | Identify appeals to ethos, pathos, and logos in advertisements | The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals:
Appeals to ethos, or character, show that the writer or speaker is trustworthy or is an authority on a subject. An ad that appeals to ethos might do one... | The ad appeals to ethos, or character. It focuses on the brand's reputation among customers. | |
train/3131 | Is schist a mineral? | [
"yes",
"no"
] | 1 | Schist has the following properties:
solid
not made by living things
found in nature
no fixed crystal structure
made mostly of pyroxene | yes or no | grade6 | natural science | earth-science | Rocks and minerals | Identify rocks and minerals | Properties are used to identify different substances. Minerals have the following properties:
It is a solid.
It is formed in nature.
It is not made by organisms.
It is a pure substance.
It has a fixed crystal structure.
If a substance has all five of these properties, then it is a mineral.
Look closely at the last thre... | Schist does not have all the properties of a mineral. So, schist is not a mineral. |
train/3132 | Will these magnets attract or repel each other? | [
"attract",
"repel"
] | 0 | Two magnets are placed as shown.
Hint: Magnets that attract pull together. Magnets that repel push apart. | closed choice | grade2 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south.
Here are some examples of magnets.... | Will these magnets attract or repel? To find out, look at which poles are closest to each other.
The north pole of one magnet is closest to the south pole of the other magnet. Poles that are different attract. So, these magnets will attract each other. |
train/3133 | Which country is highlighted? | [
"Kiribati",
"Tuvalu",
"Tonga",
"Fiji"
] | 1 | closed choice | grade8 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Tuvalu. | ||
train/3134 | Which better describes the Kaeng Krachan National Park ecosystem? | [
"It has year-round rain. It also has soil that is poor in nutrients.",
"It has soil that is poor in nutrients. It also has only a few types of organisms."
] | 0 | Figure: Kaeng Krachan National Park.
Kaeng Krachan National Park is a tropical rain forest ecosystem in western Thailand. | closed choice | grade3 | natural science | biology | Ecosystems | Describe ecosystems | An ecosystem is formed when living and nonliving things interact in an environment. There are many types of ecosystems. Here are some ways in which ecosystems can differ from each other:
the pattern of weather, or climate
the type of soil or water
the organisms that live there | A tropical rain forest is a type of ecosystem. Tropical rain forests have the following features: year-round rain and warm temperatures, soil that is poor in nutrients, and many different types of organisms. So, Kaeng Krachan National Park has year-round rain. It also has soil that is poor in nutrients. |
train/3135 | Select the organism in the same species as the small-mouth salamander. | [
"Ambystoma texanum",
"Taricha granulosa",
"Lissotriton helveticus"
] | 0 | This organism is a small-mouth salamander. Its scientific name is Ambystoma texanum. | closed choice | grade4 | natural science | biology | Scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A small-mouth salamander's scientific name is Ambystoma texanum.
Ambystoma texanum has the same scientific name as a small-mouth salamander. So, these organisms are in the same species.
Taricha granulosa does not have the same scientific name as a small-mouth salamander. So, Ambystoma texanum and Taricha granulosa are ... |
train/3136 | Select the organism in the same species as the Chinese alligator. | [
"Alligator mississippiensis",
"Alligator sinensis",
"Aequorea victoria"
] | 1 | This organism is a Chinese alligator. Its scientific name is Alligator sinensis. | closed choice | grade5 | natural science | biology | Scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A Chinese alligator's scientific name is Alligator sinensis.
Alligator sinensis has the same scientific name as a Chinese alligator. So, these organisms are in the same species.
Aequorea victoria does not have the same scientific name as a Chinese alligator. So, Alligator sinensis and Aequorea victoria are not in the s... |
train/3137 | What is the direction of this push? | [
"toward her foot",
"away from her foot"
] | 1 | A woman starts to drive her car. She uses a force to push the gas pedal with her foot. | closed choice | grade4 | natural science | physics | Force and motion | Identify directions of forces | A force is a push or a pull that one object applies to another. Every force has a direction.
The direction of a push is away from the object that is pushing.
The direction of a pull is toward the object that is pulling. | The woman pushes the gas pedal. The direction of the push is away from her foot. |
train/3138 | Which air temperature was measured within the outlined area shown? | [
"-12°C",
"0°C",
"5°C"
] | 0 | The map below shows air temperatures in the lower atmosphere on March 19, 2017. The outlined area shows an air mass that influenced weather in Asia on that day.
Look at the map. Then, answer the question below.
Data source: United States National Oceanic and Atmospheric Administration/Earth System Research Laboratory, ... | closed choice | grade6 | natural science | earth-science | Weather and climate | Identify and compare air masses | To study air masses, scientists can use maps that show conditions within Earth's atmosphere. For example, the map below uses color to show air temperatures.
The map's legend tells you the temperature that each color represents. Colors on the left in the legend represent lower temperatures than colors on the right. For ... | Look at the colors shown within the outlined area. Then, use the legend to determine which air temperatures those colors represent.
5°C.
-12°C is within this range.
0°C and 5°C are outside of this range. |
train/3139 | Which of these states is farthest south? | [
"Maine",
"West Virginia",
"North Dakota",
"Nebraska"
] | 1 | closed choice | grade4 | social science | geography | Maps | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the south arrow is pointing. West Virginia is farthest south. | |
train/3140 | Based on the definition of the "Columbian Exchange" above, which arrow could show a part of the Columbian Exchange? | [
"4",
"1",
"2"
] | 2 | In the following questions, you will learn about the Columbian Exchange. Historians use the term "Columbian Exchange" to describe the movement of diseases, animals, plants, people, and resources between the Americas and the rest of the world.
The map below shows different routes around the world. Look at the map. Then ... | closed choice | grade8 | social science | world-history | Age of Exploration | The Columbian Exchange | Remember that the term "Columbian Exchange" describes diseases, animals, plants, people, and resources traveling between the Americas and the rest of the world.
Look back at the map legend. The map legend shows that "the Americas" includes North America and South America.
So, these choices are correct:
These choices ar... | |
train/3141 | Which of these states is farthest west? | [
"South Carolina",
"New Jersey",
"Arkansas",
"Alabama"
] | 2 | closed choice | grade3 | social science | geography | Geography | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the west arrow is pointing. Arkansas is farthest west. | |
train/3142 | What type of rock is tillite? | [
"igneous",
"sedimentary",
"metamorphic"
] | 1 | This is a piece of tillite. It formed from a type of sediment called till. Till is made up of grains of various sizes, from mud to boulders. The grains are often uneven in shape.
Till is deposited by glaciers as they melt. Many layers of till can build up at the mouth of a glacier. Tillite forms when these layers are p... | closed choice | grade7 | natural science | earth-science | Rocks and minerals | Classify rocks as igneous, sedimentary, or metamorphic | Igneous rock is formed when melted rock cools and hardens into solid rock. This type of change can occur at Earth's surface or below it.
Sedimentary rock is formed when layers of sediment are pressed together, or compacted, to make rock. This type of change occurs below Earth's surface.
Metamorphic rock is formed when ... | Tillite is a sedimentary rock. Like other sedimentary rocks, it forms from layers of sediment.
Material that is eroded in nature is called sediment. Till is a type of sediment made up of grains of various sizes, from mud to boulders. Over time, layers of till can build up in places like the mouth of a glacier. The top ... |
train/3143 | Which country is highlighted? | [
"Papua New Guinea",
"Palau",
"Kiribati",
"the Federated States of Micronesia"
] | 3 | closed choice | grade7 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is the Federated States of Micronesia. | ||
train/3144 | Which country is highlighted? | [
"Vanuatu",
"Nauru",
"Kiribati",
"the Marshall Islands"
] | 1 | closed choice | grade7 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Nauru. | ||
train/3145 | Which of these oceans does the prime meridian intersect? | [
"the Indian Ocean",
"the Pacific Ocean",
"the Atlantic Ocean"
] | 2 | closed choice | grade4 | social science | geography | Maps | Use lines of latitude and longitude | Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps.
Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at 0° latit... | The prime meridian is the line at 0° longitude. It intersects the Atlantic Ocean. It does not intersect the Indian Ocean or the Pacific Ocean. | |
train/3146 | Which trait did Stenophlebia have? Select the trait you can observe on the fossil. | [
"four wings",
"thin legs"
] | 0 | This picture shows a fossil of an ancient insect called Stenophlebia.
Fossils of Stenophlebia have been found in rocks that are more than 140,000,000 years old. | closed choice | grade3 | natural science | earth-science | Fossils | Compare fossils to modern organisms | The way an organism looks or acts is called a trait. Scientists use fossils to learn more about the traits of ancient organisms.
Fossils can preserve the remains of body parts and activities. A fossil of a body part, such as a tail or a wing, can tell you what an organism looked like. A fossil of an organism's activiti... | |
train/3147 | Which rhetorical appeal is primarily used in this ad? | [
"ethos (character)",
"logos (reason)",
"pathos (emotion)"
] | 1 | closed choice | grade12 | language science | writing-strategies | Persuasive strategies | Identify appeals to ethos, pathos, and logos in advertisements | The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals.
Appeals to ethos, or character, show the writer or speaker as trustworthy, authoritative, or sharing important values with the audience. An ad that appe... | The ad appeals to logos, or reason, by presenting specific data in support of the claim that the serum has anti-aging effects. | |
train/3148 | Which of these states is farthest north? | [
"Alabama",
"North Carolina",
"Arizona",
"Kansas"
] | 3 | closed choice | grade2 | social science | geography | Geography | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the north arrow is pointing. Kansas is farthest north. | |
train/3149 | What is the name of the colony shown? | [
"New Jersey",
"Maryland",
"North Carolina",
"Alabama"
] | 2 | closed choice | grade4 | social science | us-history | English colonies in North America | Identify the Thirteen Colonies | The colony is North Carolina. | ||
train/3150 | Which statement describes the Cerrado ecosystem? | [
"It has warm summers and warm winters.",
"It has soil that is rich in nutrients.",
"It has a small amount of rain."
] | 0 | Figure: Cerrado.
The savanna grasslands of Brazil are called the Cerrado. The Cerrado covers over one-fifth of Brazil and is home to termites, anteaters, armadillos, and other organisms. | closed choice | grade6 | natural science | biology | Ecosystems | Describe ecosystems | An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment.
There are many different types of terrestrial, or land-based, ecosystems. Here are some ways in which terrestri... | A savanna grassland is a type of ecosystem. Savanna grasslands have the following features: warm summers and warm winters, a rainy season and a dry season, and soil that is poor in nutrients. So, the following statement describes the Cerrado ecosystem: warm summers and warm winters, a rainy season and a dry season, and... |
train/3151 | Is a garbage can a solid, a liquid, or a gas? | [
"a liquid",
"a gas",
"a solid"
] | 2 | closed choice | grade3 | natural science | physics | States of matter | Classify matter as solid, liquid, or gas | Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own.
Some solids can be easily folded, bent, or broken. A piece of paper is a... | A garbage can is a solid. A solid has a size and shape of its own.
You can open or close a garbage can. But it will still have a size and shape of its own. | |
train/3152 | Which colony was Middle Colonies? | [
"Georgia",
"New York",
"South Carolina"
] | 1 | The map below shows the Thirteen Colonies in 1750. | closed choice | grade4 | social science | us-history | English colonies in North America | Middle colonies: founding and government | The four Middle Colonies are dark blue on the map:
During colonial times, Delaware was usually called the Three Lower Counties on the Delaware, or the Lower Counties for short.
New York claimed part of the land that would later become the state of Vermont. But New Hampshire, a New England colony, also claimed this area... | |
train/3153 | Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"neither; the samples have the same temperature",
"sample A",
"sample B"
] | 2 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade6 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | The particles in both samples have the same average speed, but each particle in sample B has more mass than each particle in sample A. So, the particles in sample B have a higher average kinetic energy than the particles in sample A.
Because the particles in sample B have the higher average kinetic energy, sample B mus... |
train/3154 | Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The strength of the magnetic force is the same in both pairs.",
"The magnetic force is weaker in Pair 1.",
"The magnetic force is weaker in Pair 2."
] | 1 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade4 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
You c... | Distance affects the strength of the magnetic force. When magnets are farther apart, the magnetic force between them is weaker.
The magnets in Pair 1 are farther apart than the magnets in Pair 2. So, the magnetic force is weaker in Pair 1 than in Pair 2. |
train/3155 | In this food web, which organism contains matter that eventually moves to the parasol fungus? | [
"gray fox",
"swallowtail caterpillar",
"black racer",
"bobcat"
] | 1 | Below is a food web from Shenandoah National Park, a forest ecosystem in Virginia.
A food web models how the matter eaten by organisms moves through an ecosystem. The arrows in a food web represent how matter moves between organisms in an ecosystem. | closed choice | grade8 | natural science | biology | Ecological interactions | Interpret food webs II | A food web is a model.
A food web shows where organisms in an ecosystem get their food. Models can make things in nature easier to understand because models can represent complex things in a simpler way. If a food web showed every organism in an ecosystem, the food web would be hard to understand. So, each food web sho... | Use the arrows to follow how matter moves through this food web. For each answer choice, try to find a path of arrows to the parasol fungus.There are two paths matter can take from the swallowtail caterpillar to the parasol fungus: swallowtail caterpillar->pine vole->parasol fungus. swallowtail caterpillar->black bear-... |
train/3156 | Which animal is also adapted to be camouflaged in a sandy desert? | [
"fennec fox",
"skunk"
] | 0 | Horned vipers live in the deserts of Africa and the Middle East. The is adapted to be camouflaged in a sandy desert.
Figure: horned viper. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal... | Look at the picture of the horned viper.
The horned viper has sand-colored scales covering its body. It is adapted to be camouflaged in a sandy desert. The word camouflage means to blend in.
Now look at each animal. Figure out which animal has a similar adaptation.
The fennec fox has sand-colored fur covering its skin.... |
train/3157 | What can Nora and Jenna trade to each get what they want? | [
"Nora can trade her tomatoes for Jenna's broccoli.",
"Nora can trade her tomatoes for Jenna's carrots.",
"Jenna can trade her broccoli for Nora's oranges.",
"Jenna can trade her almonds for Nora's tomatoes."
] | 0 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Nora and Jenna open their lunch boxes in the school cafeteria. Neither Nora nor Jenna got everything that they wanted. The table ... | closed choice | grade7 | social science | economics | Basic economic principles | Trade and specialization | Look at the table and images.
Nora wants broccoli. Jenna wants tomatoes. They can trade tomatoes for broccoli to both get what they want. Trading other things would not help both people get more items they want. | |
train/3158 | What is the capital of Arkansas? | [
"Little Rock",
"Tallahassee",
"Oklahoma City",
"Burlington"
] | 0 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Southeast | Little Rock is the capital of Arkansas. | ||
train/3159 | Will these magnets attract or repel each other? | [
"repel",
"attract"
] | 0 | Two magnets are placed as shown. | closed choice | grade5 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on other magnets without touching them. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes are called magnetic forces.
Magnetic forces are strongest at the magnets' poles, or ends. Every magnet has two poles: a north pole (N) and a south pole (... | To predict if these magnets will attract or repel, look at which poles are closest to each other.
The north pole of one magnet is closest to the north pole of the other magnet. Like poles repel. So, these magnets will repel each other. |
train/3160 | Is Daucus carota made up of many cells? | [
"no",
"yes"
] | 1 | This organism is Daucus carota. It is a member of the plant kingdom.
Daucus carota is commonly called a carrot plant. The stem and leaves of the carrot plant are green and grow above ground. The root is often orange and grows underground. When people say they eat carrots, they usually mean the root of the carrot plant! | yes or no | grade4 | natural science | biology | Classification | Describe, classify, and compare kingdoms | In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms.
Organisms in each kingdom have specific traits. The table below sho... | Daucus carota is a plant. Plants are made up of many cells. |
train/3161 | Select the organism in the same genus as the black howler. | [
"Lontra canadensis",
"Macropus agilis",
"Alouatta caraya"
] | 2 | This organism is a black howler. Its scientific name is Alouatta caraya. | closed choice | grade8 | natural science | biology | Classification and scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A black howler's scientific name is Alouatta caraya. The first word of its scientific name is Alouatta.
Lontra canadensis is in the genus Lontra. The first word of its scientific name is Lontra. So, Lontra canadensis and Alouatta caraya are not in the same genus.
This organism and the black howler are in the same genus... |
train/3162 | What is the capital of Nevada? | [
"Las Vegas",
"Phoenix",
"Reno",
"Carson City"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify the 50 state capitals | Carson City is the capital of Nevada. | ||
train/3163 | Which of these continents does the prime meridian intersect? | [
"Europe",
"South America",
"North America"
] | 0 | closed choice | grade4 | social science | geography | Maps | Use lines of latitude and longitude | Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps.
Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at 0° latit... | The prime meridian is the line at 0° longitude. It intersects Europe. It does not intersect South America or North America. | |
train/3164 | Which country is highlighted? | [
"Tonga",
"Tuvalu",
"Kiribati",
"the Marshall Islands"
] | 1 | closed choice | grade8 | social science | geography | Oceania: geography | Identify and select countries of Oceania | This country is Tuvalu. | ||
train/3165 | Which bird's beak is also adapted to catch insects? | [
"mugimaki flycatcher",
"hanging parrot"
] | 0 | Sand martins eat insects and other small invertebrates. The shape of the 's beak is adapted to catch insects.
Figure: sand martin. | closed choice | grade4 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat easily. ... | Look at the picture of the sand martin.
A short, thin beak is light and easy to move. The sand martin uses its beak to grab fast-moving insects while flying.
Now look at each bird. Figure out which bird has a similar adaptation.
The mugimaki flycatcher has a short, thin beak. Its beak is adapted to catch insects.
The h... |
train/3166 | What is the capital of California? | [
"San Francisco",
"Juneau",
"Sacramento",
"Los Angeles"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the West | Sacramento is the capital of California. | ||
train/3167 | What is the capital of Missouri? | [
"Frankfort",
"Jefferson City",
"Saint Louis",
"Kansas City"
] | 1 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Midwest | Jefferson City is the capital of Missouri. | ||
train/3168 | Select the organism in the same genus as the gray heron. | [
"Hyla cinerea",
"Balearica pavonina",
"Ardea goliath"
] | 2 | This organism is a gray heron. Its scientific name is Ardea cinerea. | closed choice | grade5 | natural science | biology | Scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A gray heron's scientific name is Ardea cinerea. The first word of its scientific name is Ardea.
Balearica pavonina is in the genus Balearica. The first word of its scientific name is Balearica. So, Balearica pavonina and Ardea cinerea are not in the same genus.
Hyla cinerea and Ardea cinerea are not in the same genus.... |
train/3169 | Which property do these four objects have in common? | [
"hard",
"soft",
"opaque"
] | 2 | Select the best answer. | closed choice | grade5 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects... | Look at each object.
For each object, decide if it has that property.
A soft object changes shape when pressed or squeezed. The stuffed dice, the tennis ball, and the rubber band are soft, but the clay flower pot is not.
A hard object does not change shape when pressed or squeezed. The clay flower pot is hard, but the ... |
train/3170 | Select the organism in the same genus as the Steller's sea eagle. | [
"Haliaeetus leucocephalus",
"Polysticta stelleri",
"Alopias pelagicus"
] | 0 | This organism is a Steller's sea eagle. Its scientific name is Haliaeetus pelagicus. | closed choice | grade6 | natural science | biology | Classification and scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms... | A Steller's sea eagle's scientific name is Haliaeetus pelagicus. The first word of its scientific name is Haliaeetus.
Polysticta stelleri is in the genus Polysticta. The first word of its scientific name is Polysticta. So, Polysticta stelleri and Haliaeetus pelagicus are not in the same genus.
Alopias pelagicus and Hal... |
train/3171 | Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnetic force is stronger in Pair 1.",
"The strength of the magnetic force is the same in both pairs.",
"The magnetic force is stronger in Pair 2."
] | 1 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade3 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. | Distance affects the strength of the magnetic force. But the distance between the magnets in Pair 1 and in Pair 2 is the same.
So, the strength of the magnetic force is the same in both pairs. |
train/3172 | What is the expected ratio of offspring with long fur to offspring with short fur? Choose the most likely ratio. | [
"4:0",
"0:4",
"2:2",
"1:3",
"3:1"
] | 2 | In a group of Syrian hamsters, some individuals have short fur and others have long fur. In this group, the gene for the fur length trait has two alleles. The allele for long fur (f) is recessive to the allele for short fur (F).
This Punnett square shows a cross between two Syrian hamsters. | closed choice | grade8 | natural science | biology | Genes to traits | Use Punnett squares to calculate ratios of offspring types | Offspring phenotypes: dominant or recessive?
How do you determine an organism's phenotype for a trait? Look at the combination of alleles in the organism's genotype for the gene that affects that trait. Some alleles have types called dominant and recessive. These two types can cause different versions of the trait to a... | To determine how many boxes in the Punnett square represent offspring with long fur or short fur, consider whether each phenotype is the dominant or recessive allele's version of the fur length trait. The question tells you that the f allele, which is for long fur, is recessive to the F allele, which is for short fur.
... |
train/3173 | Which solution has a higher concentration of purple particles? | [
"Solution B",
"neither; their concentrations are the same",
"Solution A"
] | 1 | The diagram below is a model of two solutions. Each purple ball represents one particle of solute. | closed choice | grade8 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the purple particles represent the solute. To figure out which solution has a higher concentration of purple particles, look at both the number of purple particles and the volume of the solvent in each container.
Use the concentration formula to find the number of purple particles per mill... |
train/3174 | Which of the following was an independent variable in this experiment? | [
"the length of the filtering straw",
"the number of Giardia that remained in the water"
] | 0 | The passage below describes an experiment. Read the passage and think about the variables that are described.
Giardia is a microscopic parasite that lives in water and can infect humans. Dr. Hoffman designed a drinking straw that contained a filter to remove Giardia from water. Dr. Hoffman wanted to know if a longer f... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify independent and dependent variables | Experiments have variables, or parts that change. You can design an experiment to find out how one variable affects another variable. For example, imagine that you want to find out if fertilizer affects the number of tomatoes a tomato plant grows. To answer this question, you decide to set up two equal groups of tomato... | |
train/3175 | Identify the question that Cooper's experiment can best answer. | [
"Does water freeze more quickly than apple juice?",
"Does apple juice expand more or less than water when it freezes?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Cooper poured 30 milliliters of water into each of six measuring cups. He poured the same volume of apple juice into another six measuring cups. He kept the measuring cups in a freezer for 48 hours. Cooper then observed... | closed choice | grade7 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was gr... | |
train/3176 | Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"sample A",
"neither; the samples have the same temperature",
"sample B"
] | 0 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade8 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | The particles in both samples have the same average speed, but each particle in sample A has more mass than each particle in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B.
Because the particles in sample A have the higher average kinetic energy, sample A mus... |
train/3177 | What is the capital of South Dakota? | [
"Columbus",
"Pierre",
"Topeka",
"Lincoln"
] | 1 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Midwest | Pierre is the capital of South Dakota. | ||
train/3178 | Which statement is supported by the map? | [
"The Silk Road connected only Asia and Europe.",
"The Silk Road allowed merchants to travel from Asia to the Americas.",
"The Silk Road included both land and sea routes."
] | 2 | The map below shows a network of trade routes known as the Silk Road. Between 200 BCE and 1350 CE, merchants, or traders, traveled along many parts of these routes.
Look at the map showing the Silk Road around 100 CE. Then answer the question below. | closed choice | grade7 | social science | world-history | The Silk Road | The ancient Silk Road: geography and transportation | ||
train/3179 | What is the name of the colony shown? | [
"Alabama",
"New Hampshire",
"Georgia",
"Mississippi"
] | 2 | closed choice | grade5 | social science | us-history | English colonies in North America | Identify the Thirteen Colonies | The colony is Georgia. | ||
train/3180 | Is Nembrotha megalocera made up of one cell? | [
"no",
"yes"
] | 0 | This organism is Nembrotha megalocera. It is a member of the animal kingdom.
Nembrotha megalocera is commonly called a nudibranch. Like other nudibranchs, N. megalocera has a soft underside that is made up of a muscular foot. N. megalocera has a blue foot. | yes or no | grade4 | natural science | biology | Classification | Describe, classify, and compare kingdoms | In the past, scientists classified living organisms into two groups: plants and animals. Over the past 300 years, scientists have discovered many more types of organisms. Today, many scientists classify organisms into six broad groups, called kingdoms.
Organisms in each kingdom have specific traits. The table below sho... | Nembrotha megalocera is an animal. Animals are made up of many cells. |
train/3181 | Which animal's mouth is also adapted to eat plant matter? | [
"goat",
"Nile crocodile"
] | 0 | Blackbucks are herbivores, or plant eaters. They eat mostly grass. The 's mouth is adapted to grind up and eat plant matter.
Figure: blackbuck. | closed choice | grade3 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear ... | Look at the picture of the blackbuck.
The blackbuck has long jaws and flat teeth. Its mouth is adapted to eat plant matter. The long jaws can help the blackbuck reach grass. The flat teeth can help it cut and grind up the food into soft pieces it can swallow.
Now look at each animal. Figure out which animal has a simil... |
train/3182 | What evidence of a flood does this picture show? | [
"Much of the ground is covered by water.",
"There are many houses and trees."
] | 0 | This picture was taken during a flood. A flood can happen when an area gets a lot of rain in a short time. | closed choice | grade2 | natural science | earth-science | Earth events | Find evidence of changes to Earth's surface | Evidence is information that tells you something happened.
How do you look for evidence of a change to Earth's surface?
There are many ways to find evidence of a change to Earth's surface. One way is to look at a picture that was taken after the change.
Here are some examples of what the evidence for different changes ... | |
train/3183 | What can Kenji and Tracy trade to each get what they want? | [
"Kenji can trade his tomatoes for Tracy's sandwich.",
"Tracy can trade her broccoli for Kenji's oranges.",
"Kenji can trade his tomatoes for Tracy's broccoli.",
"Tracy can trade her almonds for Kenji's tomatoes."
] | 2 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Kenji and Tracy open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Kenji wanted br... | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Kenji wanted broccoli in his lunch and Tracy was hoping for tomatoes. Look at the labeled part of the images.
Kenji has tomatoes. Tracy has broccoli. They can trade tomatoes for broccoli to both be happier. Trading other things would not help either person get more items they want. | |
train/3184 | Which continent is highlighted? | [
"North America",
"Australia",
"Africa",
"Europe"
] | 1 | closed choice | grade5 | social science | geography | Oceans and continents | Identify oceans and continents | A continent is one of the major land masses on the earth. Most people say there are seven continents. | This continent is Australia. | |
train/3185 | Which bird's beak is also adapted to tear through meat? | [
"Cooper's hawk",
"cassowary"
] | 0 | Black vultures are scavengers. They find and eat the bodies of dead animals. The shape of the 's beak is adapted to tear through meat.
Figure: black vulture. | closed choice | grade5 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of a bird's beak is one example of an adaptation. Birds' beaks can be adapted in different ways. For example, a sharp hooked beak might help a bird tear through meat easily. ... | Look at the picture of the black vulture.
The black vulture has a sharp hooked beak. Its beak is adapted to tear through meat. The sharp hook can help the black vulture cut the meat into pieces it can swallow.
Now look at each bird. Figure out which bird has a similar adaptation.
The Cooper's hawk has a sharp hooked be... |
train/3186 | Which trait did Ursus spelaeus have? Select the trait you can observe on the fossil. | [
"front and back legs",
"rounded ears",
"brown fur covering most of its body"
] | 0 | This picture shows a fossil of an ancient animal called Ursus spelaeus.
Ursus spelaeus went extinct about 24,000 years ago. Many Ursus spelaeus fossils have been found in caves. | closed choice | grade6 | natural science | earth-science | Fossils | Compare fossils to modern organisms | The way an organism looks or acts is called a trait. Scientists use fossils to learn more about the traits of ancient organisms.
Fossils can preserve the remains of body parts and activities. A fossil of a body part, such as a tail or a wing, can tell you what an organism looked like. A fossil of an organism's activiti... | |
train/3187 | Which of the following could Lindsey and Harper's test show? | [
"if the concrete from each batch took the same amount of time to dry",
"if a new batch of concrete was firm enough to use"
] | 1 | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design.
The passage below describes how the engineering-design process was used to test a solution to a problem. Read the passage. Then answer the ques... | closed choice | grade6 | natural science | science-and-engineering-practices | Engineering practices | Evaluate tests of engineering-design solutions | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to design a... | |
train/3188 | Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnetic force is weaker in Pair 2.",
"The strength of the magnetic force is the same in both pairs.",
"The magnetic force is weaker in Pair 1."
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade3 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
You c... | Distance affects the strength of the magnetic force. When magnets are farther apart, the magnetic force between them is weaker.
The magnets in Pair 1 are farther apart than the magnets in Pair 2. So, the magnetic force is weaker in Pair 1 than in Pair 2. |
train/3189 | Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"neither; the samples have the same temperature",
"sample A",
"sample B"
] | 1 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade7 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of... | Each particle in sample A has more mass than each particle in sample B. The particles in sample A also have a higher average speed than the particles in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B.
Because the particles in sample A have the higher average ... |
train/3190 | Select the chemical formula for this molecule. | [
"HF",
"HeF",
"HF2O",
"HF2"
] | 0 | closed choice | grade5 | natural science | chemistry | Atoms and molecules | Match chemical formulas to ball-and-stick models | Every substance around you is made up of atoms. Atoms can link together to form molecules. The links between atoms in a molecule are called chemical bonds. Different molecules are made up of different chemical elements, or types of atoms, bonded together.
Scientists use both ball-and-stick models and chemical formulas ... | H is the symbol for hydrogen. F is the symbol for fluorine. This ball-and-stick model shows a molecule with one hydrogen atom and one fluorine atom.
The chemical formula will contain the symbols H and F. There is one hydrogen atom, so H will not have a subscript. There is one fluorine atom, so F will not have a subscri... | |
train/3191 | Which solution has a higher concentration of green particles? | [
"neither; their concentrations are the same",
"Solution A",
"Solution B"
] | 0 | The diagram below is a model of two solutions. Each green ball represents one particle of solute. | closed choice | grade6 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the green particles represent the solute. To figure out which solution has a higher concentration of green particles, look at both the number of green particles and the volume of the solvent in each container.
Use the concentration formula to find the number of green particles per millilit... |
train/3192 | Which solution has a higher concentration of purple particles? | [
"Solution A",
"Solution B",
"neither; their concentrations are the same"
] | 0 | The diagram below is a model of two solutions. Each purple ball represents one particle of solute. | closed choice | grade6 | natural science | chemistry | Solutions | Compare concentrations of solutions | A solution is made up of two or more substances that are completely mixed. In a solution, solute particles are mixed into a solvent. The solute cannot be separated from the solvent by a filter. For example, if you stir a spoonful of salt into a cup of water, the salt will mix into the water to make a saltwater solution... | In Solution A and Solution B, the purple particles represent the solute. To figure out which solution has a higher concentration of purple particles, look at both the number of purple particles and the volume of the solvent in each container.
Use the concentration formula to find the number of purple particles per mill... |
train/3193 | What is the capital of Nevada? | [
"Las Vegas",
"Reno",
"Sacramento",
"Carson City"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the West | Carson City is the capital of Nevada. | ||
train/3194 | Which months have average temperatures below 50°F? | [
"November through April",
"January through April",
"May through October"
] | 0 | Use the graph to answer the question below. | closed choice | grade4 | natural science | earth-science | Weather and climate | Use climate data to make predictions | Scientists record climate data from places around the world. Temperature is one type of climate data. Scientists collect data over many years. They can use this data to calculate the average temperature for each month. The average temperature can be used to describe the climate of a location.
A line graph can be used t... | To describe the average temperature trends in Denver, look at the graph.
Choice "Apr" is incorrect.
Choice "May" is incorrect.
Choice "Oct" is incorrect.
Choice "Nov" is incorrect.
Choice "Jan" is incorrect.
The average temperatures in November, December, January, February, March, and April are all below 50°F. So, Nove... |
train/3195 | Which animal is also adapted for climbing trees? | [
"okapi",
"lar gibbon"
] | 1 | s live in rain forests on the island of Sumatra in Asia. They climb trees to find food and shelter. The orangutan's hands and feet are adapted for climbing trees.
Figure: Sumatran orangutan. | closed choice | grade3 | natural science | biology | Adaptations | Animal adaptations: feet and limbs | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's feet is one example of an adaptation. Animals' feet can be adapted in different ways. For example, webbed feet might help an animal swim. Feet with thick fur m... | Look at the picture of the Sumatran orangutan.
The Sumatran orangutan has long fingers and toes. It is adapted for climbing trees. The Sumatran orangutan uses its long fingers and toes to hold on to branches while climbing.
Now look at each animal. Figure out which animal has a similar adaptation.
The lar gibbon has lo... |
train/3196 | Which of these states is farthest south? | [
"Oregon",
"New York",
"Wisconsin",
"New Mexico"
] | 3 | closed choice | grade3 | social science | geography | Geography | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north... | To find the answer, look at the compass rose. Look at which way the south arrow is pointing. New Mexico is farthest south. | |
train/3197 | During this time, thermal energy was transferred from () to (). | [
"each vial . . . the surroundings",
"the surroundings . . . each vial"
] | 1 | Scientists in a laboratory were working with insulin, a protein often used to treat diabetes. They left two identical vials of insulin in different places. This table shows how the temperature of each vial changed over 15minutes. | closed choice | grade7 | natural science | physics | Thermal energy | Compare thermal energy transfers | A change in an object's temperature indicates a change in the object's thermal energy:
An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings.
A decrease in temperature shows that the object's thermal energy decreased. So, th... | The temperature of each vial increased, which means that the thermal energy of each vial increased. So, thermal energy was transferred from the surroundings to each vial. |
train/3198 | Identify the question that Mackenzie's experiment can best answer. | [
"Are eggs more likely to float in fresh water or salty water?",
"Does the amount of water in a glass affect whether eggs sink or float in the water?"
] | 0 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Mackenzie poured four ounces of water into each of six glasses. Mackenzie dissolved one tablespoon of salt in each of three glasses, and did not add salt to the other three. Then, Mackenzie placed an egg in one glass an... | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was gr... | |
train/3199 | What is this aquatic mite's scientific name? | [
"Litarachna degiustii",
"Litarachna lopezae"
] | 1 | Scientists discovered this species of aquatic mite off the coast of Puerto Rico in 2014. The scientists named the mite after the singer Jennifer Lopez because they enjoyed listening to her music while writing about their discovery. | closed choice | grade4 | natural science | biology | Scientific names | Origins of scientific names | When a scientist identifies a new organism, he or she chooses its scientific name.
Sometimes, an organism is named after the place where it was first found. Other times, an organism is named after the scientist who first identified it. Or, the scientific name might describe the organism's physical traits.
Many of the w... | This organism's scientific name refers to Jennifer Lopez.
The word lopezae refers to Jennifer Lopez. So, this aquatic mite's scientific name is Litarachna lopezae. |
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