Why isn't Earth a perfect sphere?

Question

In general, almost everyone describes Earth as an perfect sphere, but in reality it isn't a perfect sphere. Is there any specific reason why Earth is not perfect sphere ?

Answer 1

You can read facts about it and you'd think it was way off from spherical. Not so. It is only 0.3% off true spherical which is very round! If you were holding a ball that was 2 inches in diameter, it would be equivalent to being spherical to about 5 or 6 thousandths of an inch.

There are a few reasons for imperfections. 1) its very fluid, not totally solid and spinning at an incredibly fast rate so centrifugal forces pull it's center out. There are geological features that create local abnormalities, and so forth.