The free fall acceleration g increases as one proceeds at sea...

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The free fall acceleration g increases as one proceeds at sea level, from the equator towards either pole. The reason is

A. earth is a sphere with same density everywhere

B. earth is a sphere with different density at the polar regions than in the equatorial regions

C. earth is approximately an ellipsoid having its equatorial radius greater than its polar radius by 21 km

D. earth is approximately an ellipsoid having its equatorial radius smaller than its polar radius by 21 km

Answer: Option C

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