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[Coasts] - Coggle Diagram
[Coasts]
Erosion
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Attrition
Pebbles crash into each other, causing them to break down
Abrasion
Eroded particles in the water scrape and rub against rock, removing small pieces
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Coastal landforms
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Bar
When a spit sonnects two headlands, a lagoon is formed behind the bar
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Mass movement
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Rockfalls
Material breaks up, often along bedding planes and falls down a slope
Longshore Drift (LSD)
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However, the backwash does not and is instead perpendicular to the sea
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Caves, Arches and Stacks
Caves - Formed in resistant rock when there are cracks.These cracks slowly get bigger (through hydraulic action) until they form a cave.
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Stacks - When an arch collapses, it leaves behind a stack. This stack then gets eroded down until it becomes a stump.
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Weathering
Chemical
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Carbonic acid reacts with rock that conatines calcium carbonate and so some rocks are dissolved by the rainwater
Mechanical
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Water enters rocks with gaps. When the water freezes, it expands which creates pressure
When the water thaws it contracts, releasing the pressure on the rock.
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