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mechanical weathering

noun, Geology.
any of the various weathering processes that cause physical disintegration of exposed rock without any change in the chemical composition of the rock:
Collision between rock surfaces can cause mechanical weathering.
Also called physical weathering. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary definitions for mechanical-weathering

the erosion or breakdown of rock into smaller fragments by natural physical agents with no chemicals involved; also called disintegration


Agents of mechanical weathering are frost, tree roots, etc.'s 21st Century Lexicon
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