Correct Answer: Oblate Spheroid (Geoid)
Subject: geography
Explanation: • Earth is an oblate spheroid, slightly flattened at the poles and bulging at the equator due to outward force from rotation. • This specific Earth-shape is scientifically termed a 'Geoid'. • Due to this bulge, the equatorial diameter (12,742 km) is greater than the polar diameter (12,714 km). • Earth is not a perfect sphere because centrifugal force from rotation stretches the equator. • 'Flattened poles + Bulging equator = Oblate Spheroid / Geoid'. • Earth's polar radius is 6356 km, while its equatorial radius is 6378 km.
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