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Coastal Landforms - Coggle Diagram
Coastal Landforms
Beaches
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Shingle beaches are created by high energy waves and are steep and narrow - sand particles are washed away but larger shingle is left behind. The shingle particles build up to create a steep slope
Sand beaches are created by low energy waves and are flat and wide- sand particles are small so the weak backwash can move them back down the beach, creating a long gentle slope
Sand dunes
Sand dunes are formed when sand is deposited by longshore drift is moved up by the beach by the wind
Obstacles cause wind speed to decrease so sand is depositied, forming small embryo dunes
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Embryo dunes are colonised by plants e.g. Marram grass. The roots of the vegetation stabilise the sand, encouraging more sand to accumulate there. This forms foredunes and eventually mature dunes, New embryo dunes form in front of stabilised dunes
Spits
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The area behind the spit is sheltered from waves, so material accumulates and plants are able to grow
Bars
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Offshore bars can for if the coast has a gentle slope - friction with the sea bed cause waves to slow down and deposit sediment offshore , creating a bar that is not connected to the coast
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