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coasts - Coggle Diagram
coasts
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types of erosion
corrasion (abrasion)- the sandpapering effect of sand and pebbles in the waves on the bottom of the cliff
hydraulic action- waves trap air in the cracks in the rock compressing it. when the wave recedes the pressure releases and the air expands
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weathering
types: physical/mechanical, chemical, biological
mechanical weathering: causes rocks to crumble water is a key agent as liquid can seep into cracks in the rock
chemical weathering: caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic
biological weathering: weathering caused by plants and animals. Plants and animals release acid forming chemicals that cause weathering and also contribute to the breaking down of rocks and landforms
mass movement
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slide- slow, medium wetness, material detaches from the cliff
flows- wet, fast, changed shape as they move down the slope material is mixed up
fall - fast, dry, material detaches from the cliff and hits the ground occur on steep slopes
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crevasse splay: a sedimentary deposit which forms when a stream breaks its natural or artificial levees and deposits sediment on a flood plain
3 common types of delta
cuspate: triangle in shape usually formed by opposing currents cancelling themselves out and leading to an area of low energy
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other features
levee: a natural or artificial wall that blocks water from going where you don't want it to go they prevent rivers from flooding cities in storm surges
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