12 terms

Weathering and Erosion

STUDY
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mechanical weathering
the breakdown of rock into smaller pieces by physical means
chemical weathering
The process that breaks down rock through chemical changes
frost wedging
The mechanical breakup of rock caused by the expansion of freezing water in cracks and crevices
Talus
the pile of rocks that accumulates at the base of a cliff, chute, or slope
Exfoliation
The process by which outer rock layers are stripped away
soil
A mixture of mineral particles and organic material that covers the land, and in which terrestrial plants grow.
soil profile
a vertical section through a soil showing its succession of horizons and the underlying parent material
mass movement
Any one of several processes by which gravity moves sediment downhill.
Rockfall
the rapid mass movement of rock down a steep slope or cliff
Rockslide
the rapid slide of a mass of rock downslope along planes of weakness
Mudflow
the flow of a mass of mud or rock and soil mixed with a large amount of water
Earthflow
Slow-moving downslope movement of water-saturated, clay-rich sediment, most characteristic of humid regions
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