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train/6100 | Select the mammal below. | [
"white stork",
"koala"
] | 1 | Mammals have hair or fur and feed their young milk. A giraffe is an example of a mammal. | closed choice | grade3 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common.
Scientists sort animals into groups based on traits they have in common. This process is called classification. | A white stork is a bird. It has feathers, two wings, and a beak.
Storks wade in shallow water to look for food. Storks eat fish, insects, worms, and other small animals.
A koala is a mammal. It has fur and feeds its young milk.
Koalas sleep for up to 20 hours a day! |
train/6101 | 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 2.",
"The strength of the magnetic force is the same in both pairs.",
"The magnetic force is stronger 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 | 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 closer together, the magnetic force between them is stronger.
The magnets in Pair 1 are closer together than the magnets in Pair 2. So, the magnetic force is stronger in Pair 1 than in Pair 2. |
train/6102 | Which property matches this object? | [
"scratchy",
"shiny"
] | 1 | Select the better answer. | closed choice | grade2 | natural science | physics | Materials | Identify properties of an object | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. | Look at the object.
Think about each property.
A shiny object reflects a lot of light. The bracelet is shiny.
A scratchy object is rough and itchy against your skin. The bracelet is not scratchy. |
train/6103 | Select the fish below. | [
"woodpecker",
"green moray eel",
"penguin",
"fire salamander"
] | 1 | Fish live underwater. They have fins, not limbs.
Fish are cold-blooded. The body temperature of cold-blooded animals depends on their environment.
A goldfish is an example of a fish. | 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 fire salamander is an amphibian. It has moist skin and begins its life in water.
Fire salamanders can release poison from their skin. This poison helps protect them from predators.
A penguin is a bird. It has feathers, two wings, and a beak.
Penguins live near water. Penguins cannot fly! They use their wings to swim.... |
train/6104 | Identify the question that Eliana and Dean's experiment can best answer. | [
"Does Eliana's snowboard slide down a hill in less time when it has a thin layer of wax or a thick layer of wax?",
"Does Eliana's snowboard slide down a hill in less time when it has a layer of wax or when it does not have a layer of wax?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Eliana applied a thin layer of wax to the underside of her snowboard and rode the board straight down a hill. Then, she removed the wax and rode the snowboard straight down the hill again. She repeated the rides four mo... | 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/6105 | What can Stefan and Bruce trade to each get what they want? | [
"Bruce can trade his almonds for Stefan's tomatoes.",
"Bruce can trade his broccoli for Stefan's oranges.",
"Stefan can trade his tomatoes for Bruce's broccoli.",
"Stefan can trade his tomatoes for Bruce's sandwich."
] | 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.
Stefan and Bruce open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Stefan wanted ... | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Stefan wanted broccoli in his lunch and Bruce was hoping for tomatoes. Look at the labeled part of the images.
Stefan has tomatoes. Bruce 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/6106 | Which statement describes the Gobi Desert ecosystem? | [
"It has long, cold winters.",
"It has year-round snow."
] | 0 | Figure: Gobi Desert.
The Gobi Desert is a cold desert ecosystem located in northern China and southern Mongolia. This desert is next to the Himalayan Mountains and used to be part of the Mongol Empire. | closed choice | grade5 | 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 cold desert is a type of ecosystem. Cold deserts have the following features: a small amount of rain or snow, dry, thin soil, and long, cold winters. So, the following statements describe the Gobi Desert ecosystem: a small amount of rain or snow, dry, thin soil, and long, cold winters. It has long, cold winters. It h... |
train/6107 | As the wind pushes on the kite, what is the direction of the opposing force? | [
"away from Lexi",
"toward Lexi"
] | 1 | The text below describes a pair of opposing forces. Opposing forces act on an object in opposite directions. Read the text. Then answer the question below.
Lexi flies a kite on a windy day. She uses a string to hold on to the kite. Think about two of the forces that act on the kite:
The wind pushes away from Lexi.
The ... | closed choice | grade3 | natural science | physics | Force and motion | How do balanced and unbalanced forces affect motion? | A force is a push or a pull that acts on an object. Each force acts on an object in a certain direction. If two forces act on an object in opposite directions, they are called opposing forces. | Find the direction the wind pushes on the kite.
Lexi flies a kite on a windy day. She uses a string to hold on to the kite. Think about two of the forces that act on the kite:
The wind pushes away from Lexi.
The string pulls toward Lexi.
The text tells you that the wind pushes away from Lexi. The opposite direction is ... |
train/6108 | 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 B",
"sample A"
] | 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 | 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... | 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/6109 | Identify the question that Duncan's experiment can best answer. | [
"Do steel nails rust in fewer days when submerged in a large volume of liquid compared to a small volume?",
"Do steel nails take fewer days to rust in water compared to vinegar?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Duncan put one two-inch steel nail into each of six test tubes. He added water to three of the test tubes and vinegar to the other three. In each test tube, he completely covered the nail with the same volume of liquid.... | 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/6110 | Which better describes the tide pool ecosystems in Salt Point State Park? | [
"It has water that is rich in nutrients. It also has many different types of organisms.",
"It has no sunlight. It also has daily flooding and draining of seawater."
] | 0 | Figure: Salt Point State Park.
Salt Point State Park is in northern California. The park is on the coast of the Pacific Ocean. It has many tide pool ecosystems. | 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 tide pool is a type of ecosystem. Tide pool ecosystems have the following features: daily flooding and draining of seawater, water that is rich in nutrients, and many different types of organisms. So, the tide pool ecosystems in Salt Point State Park have water that is rich in nutrients. They also have many different... |
train/6111 | What is the capital of Idaho? | [
"Boise",
"Helena",
"Louisville",
"Salem"
] | 0 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the West | Boise is the capital of Idaho. | ||
train/6112 | What is the probability that a pea plant produced by this cross will be homozygous recessive for the pod shape gene? | [
"0/4",
"3/4",
"2/4",
"1/4",
"4/4"
] | 0 | This passage describes the pod shape trait in pea plants:
Pea plants protect their seeds in pouch-like cases called pods. Some pea plants grow inflated pods, which are smooth. Other pea plants grow constricted pods, which are bumpy.
In a group of pea plants, some individuals have inflated pods and others have constrict... | closed choice | grade8 | natural science | biology | Genes to traits | Use Punnett squares to calculate probabilities of offspring types | Offspring genotypes: homozygous or heterozygous?
How do you determine whether an organism is homozygous or heterozygous for a gene? Look at the alleles in the organism's genotype for that gene.
An organism with two identical alleles for a gene is homozygous for that gene.
If both alleles are dominant, the organism is h... | |
train/6113 | Does this passage describe the weather or the climate? | [
"climate",
"weather"
] | 1 | Figure: Washington, D.C..
Washington, D.C., is located on the East Coast of the United States. Last winter, on January 13, the city received over six inches of snow.
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.
Washington, D.C., is located on the East Coast of the United States. Last winter, on January 13, the city received over six inches of snow.
The underlined part of the passage tells you about the amount of snow that fell on Washington, D.C., on January 13. This passage describes the atmospher... |
train/6114 | 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 the same in both pairs.",
"The magnitude of the magnetic force is smaller in Pair 1.",
"The magnitude of the magnetic force is smaller 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, but some of them are different shapes. | closed choice | grade7 | 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,... | Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magnitude of the magnetic force between them is smaller.
There is a greater distance between the magnets in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is smaller in Pair 1 than in Pair 2. |
train/6115 | What is the capital of Wyoming? | [
"Denver",
"Laramie",
"Dover",
"Cheyenne"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify the 50 state capitals | Cheyenne is the capital of Wyoming. | ||
train/6116 | Complete the sentence.
The word "antebellum" means (). | [
"after the long peace",
"before the feast",
"after the election",
"before the war"
] | 3 | The time period in United States history between 1820 and 1861 is often called the antebellum period. During the antebellum period, the North and South became more divided. In the following questions, you learn more about the changes that happened during the antebellum period.
The following table shows other words that... | closed choice | grade8 | social science | us-history | The Antebellum period | Causes of the Civil War: Missouri Compromise to Bleeding Kansas | Look at the underlined parts of the table.
All the words that use the root "ante" mean to come before something else. So, the root ante means "before."
All the words that use the root "bellum" mean to fight or cause war.So, the root bellum means "war."
So, the word "antebellum" means "before the war." The antebellum pe... | |
train/6117 | What is the capital of Minnesota? | [
"Minneapolis",
"Lincoln",
"Saint Paul",
"Topeka"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Midwest | Saint Paul is the capital of Minnesota. | ||
train/6118 | Which animal is also adapted to be camouflaged in a sandy desert? | [
"merveille-du-jour moth",
"bearded dragon"
] | 1 | s live in the deserts of southern Africa. The is adapted to be camouflaged in a sandy desert.
Figure: Namaqua chameleon. | 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 Namaqua chameleon.
The Namaqua chameleon 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 bearded dragon has a sand-colored body. ... |
train/6119 | Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"sample B",
"sample A",
"neither; the samples have the same temperature"
] | 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 | 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/6120 | What is the capital of New Jersey? | [
"Trenton",
"Providence",
"Baton Rouge",
"Burlington"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Northeast | Trenton is the capital of New Jersey. | ||
train/6121 | What can Francesca and Desmond trade to each get what they want? | [
"Francesca can trade her tomatoes for Desmond's sandwich.",
"Desmond can trade his broccoli for Francesca's oranges.",
"Francesca can trade her tomatoes for Desmond's broccoli.",
"Desmond can trade his almonds for Francesca'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.
Francesca and Desmond open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Francesca... | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Francesca wanted broccoli in her lunch and Desmond was hoping for tomatoes. Look at the labeled part of the images.
Francesca has tomatoes. Desmond 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/6122 | Which animal's skin is better adapted as a warning sign to ward off predators? | [
"opalescent nudibranch",
"fantastic leaf-tailed gecko"
] | 0 | Sharpnose-puffers are poisonous animals with brightly colored skin. The bright color serves as a warning sign that the animal is poisonous. The 's skin is adapted to ward off predators.
Figure: sharpnose-puffer. | closed choice | grade4 | 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 sharpnose-puffer.
The sharpnose-puffer has a poisonous body with brightly colored skin. Its skin is adapted to ward off predators. The bright colors serve as a warning sign that the sharpnose-puffer is poisonous.
Now look at each animal. Figure out which animal has a similar adaptation.
The o... |
train/6123 | Does this passage describe the weather or the climate? | [
"climate",
"weather"
] | 0 | Figure: baseball game.
The baseball players worried that the championship game might be rained out. Spring often brings low pressure systems with clouds and rain to the area near the stadium.
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 | grade6 | 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.
The baseball players worried that the championship game might be rained out. Spring often brings low pressure systems with clouds and rain to the area near the stadium.
The underlined part of the passage tells you about the usual pattern of barometric pressure near the stadium. This passage ... |
train/6124 | What is the capital of West Virginia? | [
"Biloxi",
"Kansas City",
"Charleston",
"Huntington"
] | 2 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Southeast | Charleston is the capital of West Virginia. | ||
train/6125 | Which of these continents does the equator intersect? | [
"Europe",
"Africa",
"Antarctica"
] | 1 | 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 equator is the line at 0° latitude. It intersects Africa. It does not intersect Europe or Antarctica. | |
train/6126 | Which of the following could Ernesto's test show? | [
"which design would have the greatest distance between the concert area and the road",
"which design would have the least traffic noise in the concert area",
"if at least 20% of the park would be shaded by trees in each design"
] | 0 | 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 | grade8 | 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/6127 | Which type of force from the man's hand opens the car door? | [
"push",
"pull"
] | 1 | A man gets into his car. His hand applies a force to the car door, and the door opens. | closed choice | grade3 | natural science | physics | Force and motion | Identify pushes and pulls | A force is a push or a pull that one object applies to a second object.
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 man's hand applies a force to the car door. This force causes the door to open. The direction of this force is toward the man's hand. This force is a pull. |
train/6128 | In this experiment, which were part of an experimental group? | [
"the steel squares soaked in salt water",
"the steel squares soaked in salt water and vinegar"
] | 1 | The passage below describes an experiment.
Layla was using steel to make rusted sculptures. After building each sculpture, she caused it to rust by placing it in salt water for eight hours. Layla wondered if steel would rust faster if she added vinegar to the salt water.
Layla cut ten squares of steel sheet metal. She... | closed choice | grade7 | natural science | science-and-engineering-practices | Designing experiments | Identify control and experimental groups | Experiments have variables, or parts that change. You can design an experiment to investigate whether changing a variable between different groups has a specific outcome.
For example, imagine you want to find out whether adding fertilizer to soil affects the height of pea plants. You could investigate this question wit... | In this experiment, Layla investigated whether adding vinegar to salt water affects how quickly steel squares rust. So, the steel squares soaked in salt water and vinegar were part of an experimental group.
The steel squares soaked in salt water did not get vinegar. So, they were not part of an experimental group. |
train/6129 | Which of the following statements describess living in an independent city-state? | [
"My city rules itself and is not part of a larger country.",
"All the decisions about my city are made by a faraway emperor.",
"I live by myself in the wilderness.",
"I vote for a president that rules over many different cities."
] | 0 | Athens was one of the most powerful independent city-states in ancient Greece. Look at the definitions below. Then answer the question. | closed choice | grade6 | social science | world-history | Greece | Classical Athens: geography and society | Look at the definitions.
Putting the definitions together, an independent city-state is a self-ruling city with its own government. So, a city-state rules itself and is not part of a larger country.
The ancient Greeks called a city-state a polis, which was the ancient Greek word for city. Today, the root word "polis" i... | |
train/6130 | 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."
] | 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 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker in Pair 2 than in Pair 1. |
train/6131 | What is the capital of Kansas? | [
"Montgomery",
"Billings",
"Kansas City",
"Topeka"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Midwest | Topeka is the capital of Kansas. | ||
train/6132 | Which of the following was an independent variable in this experiment? | [
"the type of bed rail",
"the number of patients who got new infections"
] | 0 | The passage below describes an experiment. Read the passage and think about the variables that are described.
Many types of bacteria cannot survive on objects made of copper. Dr. Duncan was considering using beds with copper bed rails instead of beds with plastic rails at the hospital where she worked. She wanted to k... | 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/6133 | Which material is this bowl made of? | [
"rock",
"glass"
] | 1 | closed choice | grade2 | natural science | physics | Materials | Identify materials in objects | A material is a type of matter. Wood, glass, metal, and plastic are common materials. | Look at the picture of the bowl.
The bowl is made of glass.
Glass is a clear, breakable material. Some clear bowls are made of glass, and others are made of plastic. Plastic does not break as easily as glass does. | |
train/6134 | Select the chemical formula for this molecule. | [
"CH",
"C4H",
"C2H4",
"CH4"
] | 3 | closed choice | grade7 | natural science | chemistry | Atoms and molecules | Identify chemical formulas for 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 ... | C is the symbol for carbon. According to the legend, carbon atoms are shown in dark gray. H is the symbol for hydrogen. According to the legend, hydrogen atoms are shown in light gray. This ball-and-stick model shows a molecule with one carbon atom and four hydrogen atoms. The chemical formula will contain the symbols ... | |
train/6135 | Which ocean is highlighted? | [
"the Arctic Ocean",
"the Pacific Ocean",
"the Southern Ocean",
"the Indian Ocean"
] | 3 | closed choice | grade8 | social science | geography | Physical Geography | Oceans and continents | Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean. | This is the Indian Ocean. | |
train/6136 | What is the capital of Utah? | [
"Salt Lake City",
"Fairbanks",
"Provo",
"Boise"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify the 50 state capitals | Salt Lake City is the capital of Utah. | ||
train/6137 | Which of these states is farthest south? | [
"Rhode Island",
"Idaho",
"Wisconsin",
"Indiana"
] | 3 | 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. Indiana is farthest south. | |
train/6138 | What is the capital of New Jersey? | [
"Knoxville",
"Jersey City",
"Trenton",
"Dover"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Northeast | Trenton is the capital of New Jersey. | ||
train/6139 | What is the capital of Massachusetts? | [
"Boston",
"Cambridge",
"Providence",
"Reno"
] | 0 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Northeast | Boston is the capital of Massachusetts. | ||
train/6140 | Which continent is highlighted? | [
"South America",
"Antarctica",
"Africa",
"Europe"
] | 3 | closed choice | grade6 | social science | geography | Physical Geography | 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 Europe. | |
train/6141 | What is the expected ratio of offspring with curly fur to offspring with straight fur? Choose the most likely ratio. | [
"0:4",
"2:2",
"1:3",
"4:0",
"3:1"
] | 1 | In a group of cats, some individuals have straight fur and others have curly fur. In this group, the gene for the fur type trait has two alleles. The allele for straight fur (F) is dominant over the allele for curly fur (f).
This Punnett square shows a cross between two cats. | 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 curly fur or straight fur, consider whether each phenotype is the dominant or recessive allele's version of the fur type trait. The question tells you that the F allele, which is for straight fur, is dominant over the f allele, which is for curl... |
train/6142 | Which type of force from the bulldozer clears the path? | [
"push",
"pull"
] | 0 | A bulldozer clears a path for a new road. The bulldozer applies a force to the loose dirt in front of the blade. | closed choice | grade3 | natural science | physics | Force and motion | Identify pushes and pulls | A force is a push or a pull that one object applies to a second object.
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 bulldozer applies a force to the loose dirt and clears the path. The direction of this force is away from the bulldozer. This force is a push. |
train/6143 | 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/6144 | What can Brennan and Ed trade to each get what they want? | [
"Brennan can trade his tomatoes for Ed's broccoli.",
"Brennan can trade his tomatoes for Ed's carrots.",
"Ed can trade his broccoli for Brennan's oranges.",
"Ed can trade his almonds for Brennan'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.
Brennan and Ed open their lunch boxes in the school cafeteria. Neither Brennan nor Ed 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.
Brennan wants broccoli. Ed 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/6145 | 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 smaller in Pair 2.",
"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, 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,... | 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/6146 | What is the capital of West Virginia? | [
"Louisville",
"Charleston",
"Baton Rouge",
"Huntington"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Southeast | Charleston is the capital of West Virginia. | ||
train/6147 | Select the organism in the same genus as the Japanese tree frog. | [
"Lonicera japonica",
"Strix nebulosa",
"Hyla cinerea"
] | 2 | This organism is a Japanese tree frog. Its scientific name is Hyla japonica. | 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 Japanese tree frog's scientific name is Hyla japonica. The first word of its scientific name is Hyla.
Hyla cinerea is in the genus Hyla. The first word of its scientific name is Hyla. So, Hyla cinerea and Hyla japonica are in the same genus.
Lonicera japonica and Hyla japonica are not in the same genus.
These organis... |
train/6148 | Which of the following could Joseph's test show? | [
"how many solar panels could fit on each side of the roof",
"the amount of sunlight the roof would get throughout the year",
"which side of the roof got more sun over one day"
] | 2 | 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 | grade7 | 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/6149 | Is Bertholletia excelsa made up of many cells? | [
"yes",
"no"
] | 0 | This organism is Bertholletia excelsa. It is a member of the plant kingdom.
Bertholletia excelsa is commonly called a Brazil nut tree. Brazil nut trees have a tall, thin trunk. Branches grow near the top of the tree. A Brazil nut tree can live for over 500 years! | 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... | Bertholletia excelsa is a plant. Plants are made up of many cells. |
train/6150 | Complete the statement.
Bromine is (). | [
"an elementary substance",
"a compound"
] | 0 | The model below represents a molecule of bromine. Liquid bromine is made in chemical factories. It can be used to make couches and mattresses that are fire-resistant. | closed choice | grade7 | natural science | chemistry | Atoms and molecules | Classify elementary substances and compounds using models | There are more than 100 different chemical elements, or types of atoms. Chemical elements make up all of the substances around you.
A substance may be composed of one chemical element or multiple chemical elements. Substances that are composed of only one chemical element are elementary substances. Substances that are ... | Use the model to determine whether bromine is an elementary substance or a compound.
Step 1: Interpret the model.
In the ball-and-stick model shown above, both of the balls are the same color:
. The legend shows that dark red represents the chemical element with the atomic symbol Br. So, the model shows you that a mole... |
train/6151 | 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 | 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... | 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/6152 | 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 | 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... | 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/6153 | What is the capital of Alaska? | [
"Juneau",
"Salem",
"Springfield",
"Anchorage"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify the 50 state capitals | Juneau is the capital of Alaska. | ||
train/6154 | Based on the text, how are fruit bats different from most other animals? | [
"They can \"talk\" directly to one other fruit bat.",
"They can understand some human speech.",
"They can communicate with many kinds of animals."
] | 0 | Read the text about bats.
Several kinds of animals "talk" to one another in the wild. Dolphins whistle, birds sing, and wolves howl. In recent years, researchers have paid more attention to animal "languages," and they have made some surprising discoveries. Egyptian fruit bats, for example, have a very complex way of t... | closed choice | grade5 | language science | reading-comprehension | Informational texts: level 1 | Read passages about animals | These are two ways in which fruit bats are different from most other animals:
They can "talk" directly to one other fruit bat.
The first paragraph states that Egyptian fruit bats are one of the few species that will direct calls to another individual.
They can communicate about specific problems.
The first paragraph al... | |
train/6155 | 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 1.",
"The magnitude of the magnetic force is greater in Pair 2.",
"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, but some of them are different shapes. | 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,... | The magnets in Pair 1 attract. The magnets in Pair 2 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.
Both magnet sizes and distance affect the magnitude of the magnetic force. The sizes of the magnets in Pair 1 are... |
train/6156 | Complete the sentence.
The Sunda Trench formed at a () boundary. | [
"convergent",
"transform",
"divergent"
] | 0 | Read the passage and look at the picture.
The Sunda Trench is a deep-sea trench that formed as the Indo-Australian Plate collided with the Sunda Plate. Movement at this plate boundary can cause earthquakes and devastating tsunamis. A tsunami is a series of giant waves that may form when oceanic crust is suddenly lifted... | 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 divergent boundary, two plates are moving away from each other.
At a trans... | To figure out what type of plate boundary formed the Sunda Trench, you need to know how the tectonic plates interacted. To find this out, read the passage carefully.
The Sunda Trench is a deep-sea trench that formed as the Indo-Australian Plate collided with the Sunda Plate. Movement at this plate boundary can cause ea... |
train/6157 | What is the capital of Wyoming? | [
"Lincoln",
"Cheyenne",
"Frankfort",
"Salt Lake City"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the West | Cheyenne is the capital of Wyoming. | ||
train/6158 | Which i in row B? | [
"the grocery store",
"the park",
"the police department",
"the diner"
] | 0 | closed choice | grade3 | social science | geography | Geography | Use a letter-number grid | A grid is made up of lines of squares. They are organized in rows and columns. A grid can help you use a map.
A row is a line of squares that goes from side to side. Rows are marked with letters.
A column is a line of squares that goes up and down. Columns are marked with numbers. | The grocery store is in row B. | |
train/6159 | What is the probability that a guppy produced by this cross will be homozygous recessive for the body color gene? | [
"1/4",
"0/4",
"4/4",
"2/4",
"3/4"
] | 2 | In a group of guppies, some individuals have a gray body and others have a golden body. In this group, the gene for the body color trait has two alleles. The allele for a gray body (B) is dominant over the allele for a golden body (b).
This Punnett square shows a cross between two guppies. | closed choice | grade8 | natural science | biology | Genes to traits | Use Punnett squares to calculate probabilities of offspring types | Offspring genotypes: homozygous or heterozygous?
How do you determine whether an organism is homozygous or heterozygous for a gene? Look at the alleles in the organism's genotype for that gene.
An organism with two identical alleles for a gene is homozygous for that gene.
If both alleles are dominant, the organism is h... | |
train/6160 | Which bird's beak is also adapted to tear through meat? | [
"turkey vulture",
"toucan"
] | 0 | Red-tailed hawks eat fish, mammals, and other birds. The shape of the 's beak is adapted to tear through meat.
Figure: red-tailed hawk. | 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 red-tailed hawk.
The red-tailed hawk has a sharp hooked beak. Its beak is adapted to tear through meat. The sharp hook can help the red-tailed hawk cut the meat into pieces it can swallow.
Now look at each bird. Figure out which bird has a similar adaptation.
The turkey vulture has a sharp ho... |
train/6161 | What is the capital of Colorado? | [
"Olympia",
"Boulder",
"Denver",
"Colorado Springs"
] | 2 | closed choice | grade4 | social science | geography | State capitals | Identify the 50 state capitals | Denver is the capital of Colorado. | ||
train/6162 | What is the capital of Rhode Island? | [
"Georgetown",
"Providence",
"Jersey City",
"Tulsa"
] | 1 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Northeast | Providence is the capital of Rhode Island. | ||
train/6163 | What is the expected ratio of offspring with a dwarf body to offspring with a normal-sized body? Choose the most likely ratio. | [
"2:2",
"4:0",
"1:3",
"0:4",
"3:1"
] | 0 | In a group of rats, some individuals have a normal-sized body and others have a dwarf body. In this group, the gene for the body size trait has two alleles. The allele for a dwarf body (b) is recessive to the allele for a normal-sized body (B).
This Punnett square shows a cross between two rats. | 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 a dwarf body or a normal-sized body, consider whether each phenotype is the dominant or recessive allele's version of the body size trait. The question tells you that the b allele, which is for a dwarf body, is recessive to the B allele, which i... |
train/6164 | What is the capital of Washington? | [
"Frankfort",
"Cheyenne",
"Honolulu",
"Olympia"
] | 3 | closed choice | grade3 | social science | geography | State capitals | Identify the 50 state capitals | Olympia is the capital of Washington. | ||
train/6165 | What is the capital of Oklahoma? | [
"Oklahoma City",
"Providence",
"Charlotte",
"Richmond"
] | 0 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Southeast | Oklahoma City is the capital of Oklahoma. | ||
train/6166 | Is a baseball cap a solid, a liquid, or a gas? | [
"a liquid",
"a solid",
"a gas"
] | 1 | 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 baseball cap is a solid. A solid has a size and shape of its own.
If you put a baseball cap on your head, the baseball cap will still have a size and shape of its own. | |
train/6167 | What is the capital of Utah? | [
"Helena",
"Salt Lake City",
"Tucson",
"Missoula"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify the 50 state capitals | Salt Lake City is the capital of Utah. | ||
train/6168 | What is the name of the colony shown? | [
"Indiana",
"Georgia",
"Rhode Island",
"North Carolina"
] | 1 | closed choice | grade8 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Georgia. | ||
train/6169 | During this time, thermal energy was transferred from () to (). | [
"the surroundings . . . each refrigerator",
"each refrigerator . . . the surroundings"
] | 0 | Two identical refrigerators in a restaurant kitchen lost power. The door of one fridge was slightly open, and the door of the other fridge was closed. This table shows how the temperature of each refrigerator changed over 10minutes. | closed choice | grade8 | 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 refrigerator increased, which means that the thermal energy of each refrigerator increased. So, thermal energy was transferred from the surroundings to each refrigerator. |
train/6170 | What is the capital of North Carolina? | [
"Savannah",
"Springfield",
"Richmond",
"Raleigh"
] | 3 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Southeast | Raleigh is the capital of North Carolina. | ||
train/6171 | Which of these states is farthest south? | [
"Colorado",
"Maine",
"South Dakota",
"Massachusetts"
] | 0 | 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 south arrow is pointing. Colorado is farthest south. | |
train/6172 | What do seeds grow into? | [
"flowers",
"fruit",
"new plants"
] | 2 | This drawing shows watermelon seeds. | closed choice | grade3 | natural science | biology | Plants | How do flowering plants make new plants? | Many plants have flowers. These plants can use their flowers to reproduce, or make new plants like themselves. How do plants use their flowers to reproduce?
First, the male part of the flower makes a powder called pollen. Animals, wind, or water can move pollen. Pollination is what happens when pollen is moved to the f... | Seeds can germinate and grow into new plants.
The new plants can grow fruit and flowers. But seeds do not grow directly into fruit or flowers. |
train/6173 | Does this passage describe the weather or the climate? | [
"weather",
"climate"
] | 0 | Figure: Santa Barbara.
Santa Barbara is a city in California. The temperature reached 70°F on December 25 last year.
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.
Santa Barbara is a city in California. The temperature reached 70°F on December 25 last year.
The underlined part of the passage tells you about the temperature in Santa Barbara on a specific day. This passage describes the atmosphere at a certain place and time. So, this passage describes t... |
train/6174 | 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 2.",
"The magnitude of the magnetic force is the same in both pairs.",
"The magnitude of the magnetic force is smaller 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 | 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,... | Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magnitude of the magnetic force between them is smaller.
There is a greater distance between the magnets in Pair 1 than in Pair 2. So, the magnitude of the magnetic force is smaller in Pair 1 than in Pair 2. |
train/6175 | What is the capital of Utah? | [
"Salt Lake City",
"Sacramento",
"Carson City",
"Provo"
] | 0 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the West | Salt Lake City is the capital of Utah. | ||
train/6176 | Which is this organism's common name? | [
"crown-of-thorns sea star",
"Acanthaster planci"
] | 0 | This organism is Acanthaster planci. It is also called a crown-of-thorns sea star. | closed choice | grade7 | natural science | biology | Classification and scientific names | Identify common and scientific names | An organism's common name is the name that people normally call the organism. Common names often contain words you know.
An organism's scientific name is the name scientists use to identify the organism. Scientific names often contain words that are not used in everyday English.
Scientific names are written in italics,... | Acanthaster planci is written in italics. The first word is capitalized, and the second word is not. So, it is the scientific name.
Acanthaster planci is the organism's scientific name. So, you know that crown-of-thorns sea star is the common name. |
train/6177 | What is the direction of this push? | [
"away from his hands",
"toward his hands"
] | 0 | A boy shops for groceries. He uses a force to push the shopping cart with his hands. | 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 boy pushes the shopping cart. The direction of the push is away from his hands. |
train/6178 | What is the capital of West Virginia? | [
"Raleigh",
"Cambridge",
"Huntington",
"Charleston"
] | 3 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Southeast | Charleston is the capital of West Virginia. | ||
train/6179 | What is the capital of Utah? | [
"Provo",
"Salt Lake City",
"Trenton",
"Olympia"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the West | Salt Lake City is the capital of Utah. | ||
train/6180 | What is the capital of Arizona? | [
"Salem",
"Phoenix",
"Portland",
"Tucson"
] | 1 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the West | Phoenix is the capital of Arizona. | ||
train/6181 | Select the organism in the same genus as the blue jay. | [
"Strix aluco",
"Strix nebulosa",
"Cyanocitta stelleri"
] | 2 | This organism is a blue jay. Its scientific name is Cyanocitta cristata. | 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 blue jay's scientific name is Cyanocitta cristata. The first word of its scientific name is Cyanocitta.
Cyanocitta stelleri is in the genus Cyanocitta. The first word of its scientific name is Cyanocitta. So, Cyanocitta stelleri and Cyanocitta cristata are in the same genus.
Strix aluco is in the genus Strix. The fir... |
train/6182 | 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/6183 | 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 shows that the product is used by someone who shares the audience's concerns (a working parent). | |
train/6184 | A pine tree is a conifer. What type of plant is a conifer? | [
"a gymnosperm",
"an angiosperm"
] | 0 | This diagram shows the life cycle of a pine tree. | closed choice | grade8 | natural science | biology | Plant reproduction | Angiosperm and conifer life cycles | Gymnosperms are plants that have seeds but not flowers. Conifers are a type of a gymnosperm. Instead of flowers, conifers have cones. Conifers use their cones for sexual reproduction.
Most conifer trees have both male and female cones. The male cones produce pollen. The female cones produce eggs and a sticky substance ... | Gymnosperms are plants that have seeds but not flowers. Conifers are a type of gymnosperm.
Angiosperms are flowering plants. They use their flowers to make seeds. |
train/6185 | What is the direction of this pull? | [
"toward her hand",
"away from her hand"
] | 0 | A woman unplugs a power cord. She uses a force to pull the plug out of the socket. | 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 pulls the power cord. The direction of the pull is toward her hand. |
train/6186 | 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"
] | 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 | 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... | Each particle in the two samples has the same mass, and the particles in both samples have the same average speed. So, the particles in both samples have the same average kinetic energy.
Because the particles in both samples have the same average kinetic energy, the samples must have the same temperature. |
train/6187 | What is the name of the colony shown? | [
"Virginia",
"South Carolina",
"New York",
"Vermont"
] | 2 | closed choice | grade8 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is New York.
During the colonial era, New Hampshire and New York both claimed the territory that would later become the state of Vermont. Vermont was never its own colony. | ||
train/6188 | Which animal's feet are also adapted for grabbing prey? | [
"African crowned eagle",
"dromedary camel"
] | 0 | Ospreys eat fish, mammals, and other birds. The 's feet are adapted to grab prey.
Figure: osprey. | closed choice | grade4 | 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 osprey.
The osprey has long toes with sharp claws. Its feet are adapted for grabbing prey. The sharp claws can help the osprey attack and kill its prey. The long toes can help it hold on to its prey.
Now look at each animal. Figure out which animal has a similar adaptation.
The African crowne... |
train/6189 | Which type of force from the child's finger presses the button? | [
"push",
"pull"
] | 0 | A child presses a button in an elevator. His finger applies a force to the button. | closed choice | grade3 | natural science | physics | Force and motion | Identify pushes and pulls | A force is a push or a pull that one object applies to a second object.
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 child's finger applies a force to the button as he presses it. The direction of this force is away from the child's finger. This force is a push. |
train/6190 | Which continent is highlighted? | [
"Africa",
"Asia",
"Europe"
] | 2 | closed choice | grade2 | social science | geography | Geography | Identify oceans and continents | A continent is one of the seven largest areas of land on earth. | This continent is Europe. | |
train/6191 | Select the bird below. | [
"fruit bat",
"flamingo"
] | 1 | Birds have feathers, two wings, and a beak. A penguin is an example of a bird. | closed choice | grade3 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Birds, mammals, fish, reptiles, and amphibians are groups of animals. The animals in each group have traits in common.
Scientists sort animals into groups based on traits they have in common. This process is called classification. | A fruit bat is a mammal. It has hair and feeds its young milk.
Fruit bats eat fruit and drink nectar from flowers. They have special teeth to help them bite through fruit skins.
A flamingo is a bird. It has feathers, two wings, and a beak.
Flamingos live in large groups. These groups are called flocks. |
train/6192 | Select the organism in the same species as the crystal jellyfish. | [
"Aurelia aurita",
"Aequorea victoria",
"Cyanea capillata"
] | 1 | This organism is a crystal jellyfish. Its scientific name is Aequorea victoria. | 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 crystal jellyfish's scientific name is Aequorea victoria.
Aequorea victoria has the same scientific name as a crystal jellyfish. So, these organisms are in the same species.
Aurelia aurita does not have the same scientific name as a crystal jellyfish. So, Aequorea victoria and Aurelia aurita are not in the same speci... |
train/6193 | Which statement describes the Tibetan Plateau ecosystem? | [
"It has long, cold winters and short, cold summers.",
"It has many evergreen trees."
] | 0 | Figure: Tibetan Plateau.
The Tibetan Plateau is a tundra ecosystem located in Tibet, western China, and northern India. The plateau is over 14,800 feet high and is surrounded by many mountain ranges. | closed choice | grade5 | 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 tundra is a type of ecosystem. Tundras have the following features: long, cold winters and short, cold summers, soil that is frozen year-round, and mostly small plants. So, the following statements describe the Tibetan Plateau ecosystem: long, cold winters and short, cold summers, soil that is frozen year-round, and ... |
train/6194 | What is the name of the colony shown? | [
"Tennessee",
"Washington, D.C.",
"Maryland",
"Georgia"
] | 2 | closed choice | grade8 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Maryland. | ||
train/6195 | Which material is these scissors made of? | [
"styrofoam",
"plastic"
] | 1 | closed choice | grade2 | natural science | physics | Materials | Identify multiple materials in objects | A material is a type of matter. Wood, glass, metal, and plastic are common materials.
Some objects are made of just one material.
Most nails are made of metal.
Other objects are made of more than one material.
This hammer is made of metal and wood. | Look at the picture of the scissors.
Scissors are made of two different materials. The handles are made of plastic, and the blades are made of metal. | |
train/6196 | Which of these continents does the equator intersect? | [
"North America",
"Africa",
"Antarctica"
] | 1 | closed choice | grade5 | 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 equator is the line at 0° latitude. It intersects Africa. It does not intersect Antarctica or North America. | |
train/6197 | Which is this organism's scientific name? | [
"Cyanea capillata",
"lion's mane jellyfish"
] | 0 | This organism is a lion's mane jellyfish. It is also called Cyanea capillata. | closed choice | grade7 | natural science | biology | Classification and scientific names | Identify common and scientific names | An organism's common name is the name that people normally call the organism. Common names often contain words you know.
An organism's scientific name is the name scientists use to identify the organism. Scientific names often contain words that are not used in everyday English.
Scientific names are written in italics,... | Cyanea capillata is written in italics. The first word is capitalized, and the second word is not.
So, Cyanea capillata is the scientific name. |
train/6198 | What is the name of the colony shown? | [
"Georgia",
"Maryland",
"Maine",
"North Carolina"
] | 0 | closed choice | grade5 | social science | us-history | English colonies in North America | Identify the Thirteen Colonies | The colony is Georgia. | ||
train/6199 | What is the capital of West Virginia? | [
"Laramie",
"Charleston",
"Tallahassee",
"Columbus"
] | 1 | closed choice | grade5 | social science | geography | State capitals | Identify state capitals of the Southeast | Charleston is the capital of West Virginia. |
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