coasts 2

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What is biological weathering?
Biological weatehring is the organic process of weathering that breaks down rocks or the ground surface
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How does biological weathering occur?
1. Plant roots burrow to find nutrients/food. 2. Bacteria produces chemical compounds that breaks down rocks to find food. 3. Animals search for shelter/food.
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3 examples of causes for biological weathering?
1. Algae 2. Lichens 3. Piddock shells
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What is physical weathering?
Physical weathering is the disruption of rocks and surfaces due to the weather
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Causes of physical weathering?
1. Freeze thaw 2. Temperature change 3. Exfoliation 4. Wind and rain
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What is freeze thaw?
Freeze thaw is when water in a rock crack freezes and the gap expands. This is repeated until the rock splits completely
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What is temperature change?
Rocks exoand in hot weather and contract in cold weather which causes parts to fall off, which leads to freeze thaw
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What is exfoliation?
The outer layer of rock is heated during the day and expands, and then contracts at night due to falling temerature. This constant expanding/contracting causes the top layer to fall off
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How does rain and wind contribute to weathering?
Wind blows particles of sand into the rocks and causes friction, leading to erosion. Rain has a similar effect to hydraulic action in weathering.
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What is chemical weathering?
Chemical weathering is when rain water reacts with the mineral grains in rocks to form new minerals
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How does chemical weathering occur?
High temperature and slightly acidic rain reacts with the rocks and it dissolves
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Card 2

Front

How does biological weathering occur?

Back

1. Plant roots burrow to find nutrients/food. 2. Bacteria produces chemical compounds that breaks down rocks to find food. 3. Animals search for shelter/food.

Card 3

Front

3 examples of causes for biological weathering?

Back

Preview of the front of card 3

Card 4

Front

What is physical weathering?

Back

Preview of the front of card 4

Card 5

Front

Causes of physical weathering?

Back

Preview of the front of card 5
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