Coasts

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  • Created by: emmajane_
  • Created on: 11-05-14 14:48
How are waves formed?
By wind passing over the surface area of the sea. This creates friction, which causes a swell- which is the wave
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What are the two types of waves?
Constructive and destructive
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What is swash?
When the wave breaks oand is washed up onto the beach
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What is backswash?
WHen water runs back down the beach
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What are the features of a constructive wave?
The swash is stronger than the backswash
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What are the features of a destructive wave?
The backswash is stronger than the swash
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Describe the form of a destructive wave and what it does.
It has a short wavelength and is high and deep and it erodes
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Describe the form of a constructive wave
It has a long wavelength and is long and shallow
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What do constructive waves do?
They break on the shore and deposite material, building up beaches
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Name 4 ways a destructive wave can break down a coastline
1. Hydraulic action 2. Abraision 3. Attrition 4. Solution
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What is hydraulic action?
Air's trapped in cracks of cliff. When wave breaks, air's compressed, weakening the cliff, resulting in erosion
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What is abrasion?
Bits of rock and sand gring down cliffs surface like sandpaper
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What is attrition?
Waves smash rocks and pebbles together on shore. They break and become smoother
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What is solution?
Acids contained in sea dissolves chalk and limestone cliffs
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What is deposition?
When the sea loses energy, it drops the sand, rock particles and pebbles it has been carrying.
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When does deposition happen?
When swash is stronger than abckswash- destructive wave
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Other cards in this set

Card 2

Front

What are the two types of waves?

Back

Constructive and destructive

Card 3

Front

What is swash?

Back

Preview of the front of card 3

Card 4

Front

What is backswash?

Back

Preview of the front of card 4

Card 5

Front

What are the features of a constructive wave?

Back

Preview of the front of card 5
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