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The phenomenon of precession of the Earth's spin axis is caused by the ?

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Old 02-20-2008, 04:13 AM
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Default The phenomenon of precession of the Earth's spin axis is caused by the ?

a. Variation of the spin rate of Earth.
b. tidal ebb and flow of ocean waters upon Earth.
c. varying intensity of sunlight upon Earth throughout the year.
d. gravitational pull of Moon and Sun upon the Earth's equatorial bulge.
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