| 21. | If the mantle were static, these low-density regions would be geoid lows.
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| 22. | The Earth geoid is essentially the figure of the Earth abstracted from its topographic features.
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| 23. | Experimental determination of the gravitational potential at the geoid surface is a task in physical geodesy.
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| 24. | This allows direct measurement of the geoid, since the ocean surface closely follows the geoid.
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| 25. | This allows direct measurement of the geoid, since the ocean surface closely follows the geoid.
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| 26. | The earth does not have a perfect ellipsoidal shape, but is described as a geoid.
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| 27. | A rise in sea level, however, would expand the geoid and mean sea level.
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| 28. | :See geoid and equipotential surface.
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| 29. | Therefore, the Mars geoid is essentially the figure of Mars abstracted from its topographic features.
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| 30. | :: WGS 84 measures the reference ellipsoid of the geoid, not the Earth itself.
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