noun
a three-dimensional representation of the earth's surface that takes into account variations in gravity and topography
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The geoid is a model representing the shape of the Earth, taking into account variations in gravity and the Earth's rotation.
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The geoid basically shows how lumpy or bumpy the Earth's surface is due to gravity.
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The geoid is like a 3D map of the Earth's lumps and bumps caused by gravity and rotation.
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The geoid can be thought of as the Earth's unique fingerprint, showing its irregularities and imperfections.