Because a sphere flattened at the poles and bulging at the equator, the Earth is an ellipsoid of rotation. Between geoid and ellipsoid there is a difference of plus or minus 100 m, its volume being identical.
On the other hand, the shape of the geoid is similar to a pear, with the southern hemisphere than the northern curved and the Austra circumpolar boreal flatter than that. In this case, the Earth is called terroid or telluroid.
Follow 360 ˚ animation that gives the real picture of the shape of the Earth, though on the surface it would deprive seas and oceans!
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