The correct answer is A: shape. Geoid refers to the actual shape of the Earth, which is an irregular surface that approximates mean sea level. It is used as the reference datum for measuring elevations and depths.
A.shape✓ Correct
B.colour
C.axis
D.orbit
Explanation
Geoid refers to the actual shape of the Earth, which is an irregular surface that approximates mean sea level. It is used as the reference datum for measuring elevations and depths.
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