Weathering
- Created by: HannahG25
- Created on: 05-04-14 10:43
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- Weathering
- Weathering of rocks is the breakdown of rocks where they are.
- Mechanical Weathering is the breakdown of rock without changing its chemical composition e.g. freeze thaw weathering
- Happens when the temperature alternates above and below 0 degrees
- Water gets into the rock that has cracked
- When the water has frozen it expands putting pressure on the rock
- When t he water contacts and the pressure is released.
- The process is repeated and the rock eventually breaks
- Chemical Weathering is the breakdown of rocks by changing the chemical composition
- Rainwater has carbon dioxide dissolved in it which makes it a weak carbonic acid
- Carbonic acid reacts with the rock that contains calcium carbonate e.g. chalk
- Biological weathering this is the breakdown of rocks by living things
- An example plant roots can break down rocks by growing into cracks on the surface and pushing them apart
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