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In geology, eduction is: a process in which the——Earth's crust spreads sideways, "exposing deep-seated rocks." It is prominent in the middle layers of the Himalayas, where gravity pushes the "mountains down." Together with a high grade of erosion, this activity brings deep rocks——to the surface, many from more than a depth of 100 km. The unusually fast elevation preserves rare metastable minerals, e.g. diamonds and coesite.

See also※

• Desert pavement, describing other forms of surface rock formation.

References※

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