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Sun, Earth, Moon Relationships Vocabulary #6

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Rotation   Any object that is spinning on its axis. Ex: The spinning of Earth on its imaginary axis, which takes about 24 hours to complete and causes day and night to occur.  
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Revolution   Any object that is circling another object. Ex: The Earth’s yearlong elliptical orbit around the Sun.  
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Axis   A line that is drawn through the center of an object. Ex: The Imaginary vertical line that cuts through the center of Earth and around which Earth spins.  
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Spring Tide   A line that is drawn through the center of an object. Ex: The Imaginary vertical line that cuts through the center of Earth and around which Earth spins.  
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Neap Tide   A line that is drawn through the center of an object. Ex: The Imaginary vertical line that cuts through the center of Earth and around which Earth spins.  
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Waxing   Describes phases following a new moon as more of the Moon’s lighted side becomes visible. (Add wax to make is shine)  
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Waning   Describes phases that occur after a full moon, as the visible lighted side of the Moon grows smaller. (when you wane, it sounds like whine, and we want you to go away)  
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Gibbous   This is when more than one quarter of the moon is visible, but it has not yet reached the full moon.  
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Gravitational Attraction   The force of attraction between all masses in the universe. The force of the attraction increases as mass increases. Ex: The Sun’s pull on the Earth.  
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Centrifugal Force   The explanation of an apparent outward pull that is experienced as an object travels in a circle. This is not a real force but the apparent outward pull is increased as mass, speed or distance from the center point increases.  
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