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geoid
[jee-oid]
noun
an imaginary surface that coincides with mean sea level in the ocean and its extension through the continents.
the geometric figure formed by this surface, an ellipsoid flattened at the poles.
geoid
/ ˈːɔɪ /
noun
a hypothetical surface that corresponds to mean sea level and extends at the same level under the continents
the shape of the earth
geoid
The hypothetical surface of the Earth that coincides everywhere with mean sea level and is perpendicular, at every point, to the direction of gravity. The geoid is used as a reference surface for astronomical measurements and for the accurate measurement of elevations on the Earth's surface.
Other 51Թ Forms
- geoidal adjective
51Թ History and Origins
Example Sentences
As a result, if all of Earth's ocean existed under gravity without factors like wind and tides, the planet would more closely resemble a geoid: Imagine a golf ball melted to the point where some of its dimples expanded and other collapsed, and you have a good approximation a geoid's appearance.
These plumes, along with the nearby mantle structure, are believed to form the "gravity" hole because it winds up being the lowest point in that geoid, creating its biggest gravitational anomaly.
Forte also claimed the computer simulations did not accurately project the actual shape of Earth as a geoid.
This produces an exaggerated visualization of our planet’s gravitational high and low spots called the global geoid.
Pal says the geoid low probably took its present shape about 20 million years ago, when the plumes started to spread within the upper mantle.
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