by 
Arnel
ANSWERS: 5
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The shadow of the earth.
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The moons position in it's orbit around earth.
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The relative position of Paris Hilton to Britney Spears.
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which phases are you speaking of? it's different shadows, or it's orbital changes?
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The orbit of the Moon causes this. ( http://en.wikipedia.org/wiki/Lunar_phase ) Lunar phase (or Moon phase) refers to the appearance of the illuminated portion of the Moon as seen by an observer, usually on Earth. The lunar phases vary cyclically as the Moon orbits the Earth, according to the changing relative positions of the Earth, Moon, and Sun. Here is an animation for you. http://upload.wikimedia.org/wikipedia/commons/8/86/Lunar_libration_with_phase_Oct_2007.gif
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