AS Geog: Weathering Processes
Just a summary of weathering processes to note for revision. (Best to zoom in at 60%)
- Created by: Abbie Roberts
- Created on: 18-04-13 15:49
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- Weathering Processes
- Mechanical
- Freeze Thaw-Water accumulates in joints/cracks of rock, expands by 9% when below freezing. The water freezes to become ice.
- Salt Crystal Growth-Temperatures fluctuate around 26-28oC, sodium sulphate and sodium carbonate expand by 300%, disintegrating rocks in the process.
- Pressure release-Overlying rock is removed by erosion, causing underlying ones to expand and fracture parallel to surface.
- Chemical
- Carbonation-Occurs on rocks with calcium carbonate eg Chalk and limestone. Rainfall dissolves carbon dioxide, forming a weak carbonic acid. Calcium carbonate reacts with acidic water and forms bicarbonate which is soluble
- Hyration-Minerals absorb water, expand and change.
- Oxidation-Occurs when iron compounds react with oxygen to produce a reddish brown coating on rocks
- Biological
- Mechanical impacts
- Growth of roots from vegetation, exerting pressure
- Chemical impacts
- Release of organic acids, bird droppings, etc
- Mechanical impacts
- Mechanical
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