The geoid is an equipotential surface that represents the mean sea level of the Earth's oceans, extended under the continents. It is a crucial concept in geophysics and is used to understand Earth's shape and gravity field. Unlike a geometric shape, such as a sphere or an ellipsoid, the geoid is an irregular surface resulting from variations in gravitational pull caused by factors like the distribution of mass within the Earth and the topography of the land and ocean floors.
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