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Message: <blockquote data-quote="dinu_rashi" data-source="post: 3155988" data-attributes="member: 104833"><p style="text-align: center"><strong><u>Why is the Earth round?</u></strong></p> <p style="text-align: center"></p> <p style="text-align: center"></p><p style="text-align: left"><span style="font-size: 12px">To a first-order approximation the Earth is round.  This</span></p> <p style="text-align: left"><span style="font-size: 12px">is due to gravity.  Gravity pulls with equal strength in all</span></p> <p style="text-align: left"><span style="font-size: 12px">directions; therefore any variations from a spherical</span></p> <p style="text-align: left"><span style="font-size: 12px">shape will lead to gravitational forces that</span></p> <p style="text-align: left"><span style="font-size: 12px">bring the shape back into that of a sphere.</span></p> <p style="text-align: left"><span style="font-size: 12px"></span></p> <p style="text-align: left"><span style="font-size: 12px">This is without considering the rotation of the earth,</span></p> <p style="text-align: left"><span style="font-size: 12px">however.  The rotation of the earth adds centrifugal</span></p> <p style="text-align: left"><span style="font-size: 12px">effects, which cause the earth to bulge slightly at</span></p> <p style="text-align: left"><span style="font-size: 12px">its equator and flatten slightly at its poles.</span></p> <p style="text-align: left"><span style="font-size: 12px">(This is like twirling a rock on the end of a string</span></p> <p style="text-align: left"><span style="font-size: 12px">and then letting go--the rock flies away from the</span></p> <p style="text-align: left"><span style="font-size: 12px">twirler.)  Because of these centrifugal effects, the</span></p> <p style="text-align: left"><span style="font-size: 12px">distance from the center of the earth to the surface</span></p> <p style="text-align: left"><span style="font-size: 12px">of the earth is about 0.33% shorter at the poles</span></p> <p style="text-align: left"><span style="font-size: 12px">compared to the equator.</span></p> <p style="text-align: left"><span style="font-size: 12px"></span></p></p> <p style="text-align: center"></p> <p style="text-align: center"></p> <p style="text-align: center"></p></blockquote><p></p>

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