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5th grade Science 2nd Semester

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Question
Answer
sun   largest star, source of all earth's energy, ball of plasma  
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Earth   only planet that supports life  
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reflection   waves bending off a surface  
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mass   amount of matter in an object  
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matter   anything that has mass and volume  
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volume   amount of space an object takes up  
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electric current   movement of electrons that flow  
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kinetic energy   form of energy associated with motion  
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potential energy   stored energy  
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velocity   speed and direction of an object  
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speed   rate or measure of motion  
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displacement   how far an object has moved  
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distance   how far an object has traveled  
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acceleration   rate at which speed or direction is changing  
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protons   positive charge  
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nuetrons   no charge  
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electrons   negative charge  
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single atom   smallest part of an atom  
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gases   spread to fill container, can be compressed  
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liquids   not easily compressed, takes the shape of the container  
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solids   keep shape, cannot be compressed  
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minerals   solid material of earth's crust with a definite composition  
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metamorphic rock   formed from heat and pressure inside the earth  
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igneous rock   formed from magma  
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sedimentary rock   materials cement together by chemicals or pressure  
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