Breakup of rocks in situ (without moving)
Weathering is different to erosion
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What are the 2 ways of rocks being broken up?
Deposition
Disintegration
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What is Decomposition?
Chemical weathering - action of a chemical that breaks down rock or changes its substance
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What is Disintegration?
Mechanical weathering - action of a physical environment that breaks down rock into smaller pieces
e.g. temperature
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What are the types of weathering?
Mechanical (i.e. physical) - disintegration
Chemical - decomposition
Biological
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Physical/mechanical weathering breaks down rock in 2 ways:
- Granular disintegration
- Block integration
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What are the Types of Mechanical Weathering?
Freeze-thaw
Heating & Cooling
Salt crystallization
Pressure release
Vegetation root action (mixture of both physical & chemical weathering)
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What are the Types of Chemical Weathering?
Carbonation
Hydrolysis
Hydration
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What is biological weathering?
Occurs through a combination of disintegration & decomposition (physical & chemical weathering)
Plants & animals:
- Chemically alter rocks
- Physically break them down through their growth & movement
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