Coastal Weathering and erosion

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What does weathering mean?
breakdown of rocks of rocks where they are
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What does erosion mean?
Rocks are broken down and carried away by something
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Rock is broken down by?
mechanical and chemical weathering
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What is mechanical weathering?
Breakdown of rock without changing bits chemical composition
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For example?
Freeze-thaw weathering
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Freeze thaw weathering- It happens when?
When the temperature alternates above and below 0oc
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Freeze thaw weathering-Water gets into rocks that has _____. For example?
cracks (granite)
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Freeze thaw weathering-What happens to the water when it freezes?
It expands which puts pressure on the rock
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Freeze thaw weathering-what happens to the water when it contracts?
Releases the pressure on the rock
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Freeze thaw weathering-Repeated freezing and thawing widens?
The cracks and causes the rock to break up
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What is chemical weathering?
The breakdown of rock by changing its chemical compositioncar
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For example?
Carbonation weathering -happens in warm and wet conditions
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Carbonation weathering- Rainwater has Co2 dissolved in it, which makes?
weak carbonic acid
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Carbonation weathering- Carbonic acid reacts with?
Rock that contains calcium carbonate (carboniferous limestone, so the rocks are dissolved by rainwater
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What is mass movement?
Is the shifting of rocks and loose material down a slope
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It happens when the force of gravity acting on a slope is greater than the force supporting it
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Mass movements causes?
coasts to retreat rapidly
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When is this likely to happen?
When the material is full of water-it acts as lubricant
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What are the two types of mass movement?
sildes (straight line) and slumps (rotation)
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Waves wear away the coast using?
The four processes of erosion
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What are the 4 process of erosion?
Hydraulic power , Abrasion, attrition, solution
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What does hydraulic power mean?
waves crash against rock and compress air in the cracks.This puts pressure on the rock. Repeated compression widens the cracks and makes bits of rock break off.
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What does abrasion mean?
Eroded particles in the water scrape and rub against rock, removing small peices
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What does attrition mean?
Eroded particles in the water smash into each other and break into smaller fragments. Their edges also get rounded off as they rub together
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What does solution mean?
Weak carbonic acid in seawater dissolves rock like chalk and limestone
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Whats the frequency of destructive waves
High-10-14 waves per min
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The waves that carry out erosional processes are called?
Destructive waves
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How do they look like?
High and steep
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How does the swash and backwash look like?
Their backwash is more powerful than swash
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Card 2


What does erosion mean?


Rocks are broken down and carried away by something

Card 3


Rock is broken down by?


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Card 4


What is mechanical weathering?


Preview of the front of card 4

Card 5


For example?


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