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Chapter 4

Weathering and Soil Formation

QuestionAnswer
Abrasion the process of wearing something down by friction
Chemical weathering the breakdown or decomposition of rock that takes place when minerals change through chemical process
Desertification the expansion of desert conditions in areas where the natural plant cover has been destroyed
Exfoliation in geology, the process in which layers or sheets of rock gradually break off
Humus the decayed organic matter in soil
Mechanical weathering the breakdown of rock into smaller pieces of the same material without any change in its composition
Soil horizon a soil layer with physical and chemical properties that differ from those of soil layers above or below it
Soil profile the soil horizons in a specific location; a cross section of soil layers that display all soil horizons
Weathering the process by which natural forces break down rocks
Created by: avaught
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