Types of weathering
Mindmap of the types of weathering
- Created by: emily_w
- Created on: 29-04-14 17:31
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- Weathering
- Weathering is when rock is moved or worn away by natural forces. It is NOT interchangeable with erosion
- Organic acids
- waste dumping causes organic acids to form on the surface, which then leach into the soil
- decreases pH of water in soil
- acids react with water, which destableises the rock
- Tree root erosion
- roots fill cracks in rock when trees grow near it
- roots expand as tree grows, forcing rock apart
- process is similar to freeze thaw weathering
- Thermal expansion
- rock expands when heated up and contracts when cooled down.
- outer layer of rock eventually falls off
- happens over a long period of time
- Oxidisation
- oxygen reacts with minerals in rock, especially iron
- rock cracks when rock is soluble and air is acidic
- more iron=easier oxidisation
- Freeze-thaw weathering
- water gets into cracks in rocks
- freezes overnight and expands when it cracks in the morning. crack widens
- causes potholes
- Solution
- some salts water soluble, iron soluble in acidic conditions--pH of 3
- any process which dissolves substance in solvent
- minerals then transported by water after solution
- acids react with water, which destableises the rock
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