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Science vocabulary

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
astronomy   the study of the moon, stars and other objects in space  
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axis   an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates  
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equinox   the two days of the year on which neither hemisphere is tilted toward or away from the sun  
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gravity   a force that moves rocks and other materials downhill: the force that pulls objects toward each other  
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moon   a natural satellite that revolves around a planet  
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orbit   the path of an object as it revolves around another object in space  
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phase   one of the different apparent shapes of the moon as seen from Earth  
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revolution   the movement of an object around another object  
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rotation   the spinning motion of a planet on its axis  
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solstice   the two days of the year on which the sun reaches its greatest distance north or south of the equator  
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