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Unit 3

Weathering and Erosion

TermDefinition
weathering the process by which natural forces break down rocks.
mechanical/ physical weathering the breaking up of rocks by physical forces, but does not change their composition.
exfoliation a process in which layers or sheets of rock gradually break off.
abrasion the process of wearing down by friction, the rubbing of one object or surface against another.
chemical weathering is the breakdown of rocks by chemical reactions that change the rocks' makeup, or composition.
humus decayed organic matter in soil
soil horizon layer of soil with properties that differ from those of the layer above or below it.
soil profile the soil horizons in a specific location
desertification the expansion of desert conditions in areas where the natural plant cover has been destroyed
conservation the process of protecting or saving a natural resource
organic matter soil derived or comes from living things
constructive forces forces that build up Earth's surface such as volcanic eruptions and deposition of sediment
destructive forces forces that tear down or wear away Earth's surfaces such as ersosion
permeability soil's ability to let water and air pass through it
delta a land formation created by the deposition of sediment at the mouth of a river
Created by: rdooley
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