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Dynamic Earth 1.2
lesson 2 weathering
Term | Definition |
---|---|
weathering | the breakdown of rock material by physical and chemical processes |
physical weathering | the process by which rock is broken down into smaller pieces by physical changes |
abrasion | the breaking down and wearing away of rock material by the mechanical action of other rock |
contract | a decrease in size |
ice wedging | water seeps into cracks in the rocks and expands as it freezes until the rock breaks apart |
exfolation | the process by which the outer layers of rock slowly peel away due to pressure changes |
animal action | animals cause physical weathering when they dig and allow rocks to be exposed |