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Earths Surface Ch 4

Vocabulary from Ch. 4: Weathering and Soil Formation

QuestionAnswer
weathering the process by which natural forces break down rocks.
mechanical weathering the breaking up of rocks by physical forces.
exfoliation a process in which layers or sheets of rocks gradually break off; sometimes called onion-skin weathering.
abrasion the process of wearing down by friction, the rubbing of one object or surface against another.
chemical weathering the breakdown of rocks by chemical reactions that change the rocks' makeup, or composition.
humus the decayed organic matter in soil.
soil horizon a layer of soil with properties that differ from those of the layer above or below it.
soil profile made up of the soil horizons in a specific location.
desertification the expansion of desert conditions in areas where the natural plant cover has been destroyed.
Created by: misskazantzis
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