Question

what is geoid?
what the word means?
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Answer 1

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here is your answer

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a hypothetical solid figure whose surface corresponds to mean sea level and its imagined extension under (or over) land areas.

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Answer 2

Answer:

The shape of the earth is defined as that of a geoid and not compared exactly to a sphere.

The word geoid suggests the equipotenial surface of the Earth, that is equivalent to sea level over the oceans.

It refers to such a solid figure whose surface corresponds to mean sea level and its imagined extension under or over land areas.