Question

give reason why the earth's shape is geoid

Answer 1

Answer:

The geoid is a shape like the surface of the Earth. ... For many practical purposes, a simpler shape is used because that makes calculations easier. That shape is called a reference ellipsoid. In basic education, the shape of the Earth is described as being like an orange, a sphere but wider round the equator.

Answer 2

The radius at the equator is larger than at the poles due to the long-term effects of the earth's rotation. This is why earth's shape is considered geoid.

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