8.7A
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| Axis | imaginary line about which an object rotates
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| Gravitational attraction | force of attraction between all masses in the universe, especially the attraction of the Earth's mass for bodies near its surface
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| Rotational axis | an imaginary line in which a three-dimensional object rotates around; the Earth spins on its axis
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| Prograde rotation | the counterclockwise spin of a planet or moon when seen from above the planet's or moon's north pole
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| Retrograde rotation | the clockwise spin of a planet or moon when seen from above the planet's or moon's north pole
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| Rotation | the spinning motion of a body on its axis
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| Tilt of the Earth's Axis | causes sunlight to hit different parts of the Earth more directly during the summer and less directly during the winter creating seasonal changes
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| Earth's rotation | causes night and day because the rotation causes locations on Earth to be rotating towards the sun and away from the sun.
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