Weathering
Mehcanical, Chemical and Biological weathering
- Created by: Jenny Jones
- Created on: 22-04-14 11:44
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- Weathering
- Mechanical
- the breakdown of rocks without changing its chemical composition
- Freeze-thaw weathering
- 1) water gets into cracks in rocks
- 2) when water freezes it expands, puts pressure on rock
- 3) when water thaws it contracts, releases pressure
- 4) repeated freezing and thawing, widens cracks and causes rock to break up
- Onion skin weathering
- Exfoliation: outer layer of rock flakes away from the rest
- happens due to very hot weather
- as rock repeatedly expands and contracts, causes outer layer of rock to peel away
- the decay or disintegration of rocks from their original place
- Chemical
- the breakdown of rock by changing its chemical composition
- Carbonation weathering
- 1) rain has carbon dioxide in it, makes a weak carbonic acid
- 2) carbonic acid reacts with rock that contains calcium carbonate. Rocks are dissolved by the rainwater
- Biological
- the breakdown of rocks by plants (tree roots) and animals
- Mechanical
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