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Mechanical weathering; as distinct from chemical weathering; occurs when the surface of a rock (say) is mechanically abraded. Such as the grits of a river wear away the bedrock. The aeolian sands in the desert will sculpt exposed rock ribs.

A glacier will gouge the surface away by grinding the bedrock with boulders, stones, and grit entrained in the ice mass. This type of weathering produces vast quantities of rock flour. Much of the volume of a glacial valley has been turned into rock flour.

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13y ago

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