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Originally Posted by Sun Tzu
That's getting excessive. There is also another field of thought that there maybe a combination of the two theories. Pangea gives no address to accreation or Earth is flatter at the poles.
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The Earth is flatter at the poles because it spins. Centrifugal force cause the equator to 'bulge,' creating an oblate spheroid. This is backed up by the other observable planets; the faster the rotation, the more oblate the body. No expansion necessary.
As to accretion.. well, as I said earlier, I don't know a whole lot about geology; however, I was under the impression that this is adequately explained via tectonics.
Wiki goodness.