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Why does free-fall acceleration (g) increase as one moves from the equator toward either pole?

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1. Why does free-fall acceleration (g) increase as one moves from the equator toward either pole?

Earth is a perfect sphere with uniform density everywhere

Earth has different density at the poles than at the equator

Earth is an ellipsoid, with its equatorial radius about 21 km greater than its polar radius

Earth is an ellipsoid, with its polar radius greater than its equatorial radius

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