sentences
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melting means a substance changes from a solid into a liquid by increasing heat energy
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as state of matter changes , mass will not change
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gold melts
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as the class of a rock changes , the mass of the rock will stay the same
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a rock changes from sandstone into quartzite
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a quartzite is a kind of metamorphic rock
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sandstone is a kind of sedimentary rock
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class is a property of a rock and includes values of sedimentary / metamorphic / igneous
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matter in the solid phase has definite shape
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an eraser is a kind of solid
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definite shape means the shape of an object stays the same when moved to different spot
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tearing means changing a whole into pieces
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a paper bag is ripped into pieces
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ripping means tearing
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a piece of an object is smaller in size than the entire object / whole object
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magnifying makes seeing small things easier
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seeing small things with bare eye is difficult
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hair is thin
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texture of an object can sometimes be told by looking at the object
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a wooden block is pushed across a sheet of sandpaper
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an object being pushed across another object causes their surfaces to move against each other
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friction causes the temperature of an object to increase
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friction occurs when two object 's surfaces move against each other
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smooth is a kind of texture
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texture is a property of objects and includes ordered values of smooth or rough
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matter in the solid phase has definite volume
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one sample is a solid sample of aluminum
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matter in the liquid phase has definite volume
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one sample is a liquid sample of aluminum
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water is in the gas state , called water vapor / steam , for temperatures between 373 / 212 / 100 and 100000000000 k / f / c
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water is in the liquid state , called liquid water , for temperatures between 273 / 32 / 0 and 373 / 212 / 100 k / f / c
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earth's atmosphere contains water vapor
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arctic environments contain ice
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the oceans are located on earth
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earth's atmosphere is located on earth
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the oceans contain liquid water
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arctic environments are located on earth
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water is in the solid state , called ice , for temperatures between 0 / -459 / -273 and 273 / 32 / 0 k / f / c
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air is a kind of gas
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matter in gas phase takes the shape of the entire container
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the item takes the shape of the entire container
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matter in the gas phase has variable volume
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matter in the gas phase has variable shape
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matter with variable volume and shape expands to fill the shape and size of its entire container
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air is a kind of gas
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a bubble is made of pockets of gas trapped inside a liquid or solid
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soap bubbles are made of air trapped inside soap liquid
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a compound is a kind of substance
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matter in the liquid phase has variable shape
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matter in the liquid phase has definite volume
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indefinite means variable
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substances are made of matter
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matter in the liquid phase has definite volume
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if something has a definite volume , then its volume will not change when transferred into a different container
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particles in a liquid flows past each other
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the particles in the substance are close and able to flow past each other
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the substance has a variable shape
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matter in the liquid phase has variable shape
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particles in a liquid are close to each other
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seeing requires light
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reading requires seeing
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a light bulb generates visible light when it is turned on
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an airplane is fast in speed
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an airplane is used for moving people to far away places
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an ocean is a kind of body of water
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a airplane is used for moving products across bodies of water
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a ship is used for moving products across bodies of water
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a cake is a kind of baked product
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baking is when a human makes food by adding heat
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transportation technology is used for moving people / products
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transportation technology is a kind of system for moving people and products
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a microscope is a kind of optical tools for observing small things
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a microscope is used to see small things by making them appear bigger
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biologists study small things such as cells
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a telescope is a kind of optical instrument for observing celestial objects
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tool means instrument
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making scientific discoveries requires observing
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astronomers study celestial objects
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a telescope is used for observing celestial objects by astronomers
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killing microorganisms in food can be used to extend the shelf life of that food
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companies irradiate some fruits and vegetables
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irradiating food can be used to kill existing microorganisms in the food
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cheap means low in cost
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making products for cheaper has a positive impact on manufacturing
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a mass production manufacturing system makes products more cheaply than a custom manufacturing system
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something that is used for communication increases communication
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a weather report is a kind of information
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a radio is used for communication
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communication is used to share information
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a computer is used for communication / finding information
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radio transmitter emits radio waves
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radio station broadcasting is a source of radio waves
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a source of something emits that something
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an engineer constructs a prototype from wood
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the engineer needs a tool to smooth the surface of the wooden prototype
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sandpaper is used to smooth the surface objects
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a prototype is a kind of object
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sandpaper is a kind of tool for smoothing objects
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pliers are made of two levers for gripping
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pliers are a kind of hand tool
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