Coastal Processes - Erosion, Transportation & Deposition | AQA GCSE 9-1 Geography

What are the four types of erosion? What is hydraulic action? What are abrasion, attrition and solution? What are the types of transportation? What is saltation, suspension and traction? What is deposition? Where does deposition occur?
This is the thirty-eighth video for the AQA GCSE 9-1 Geography course, and the fifth video of the Physical Landscapes topic.
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Video Script:
Coastal erosion is the wearing away of rocks by the sea, often due to destructive waves. There are four main types of erosion:
Hydraulic action is caused by the power of the waves - air is forced into cracks in the rocks, and when the wave retreats this air rushes out, largening cracks and causing the rocks to break apart.
Abrasion, also known as corrasion, is where rocks are picked up by the waves and hurled at the cliffs.
Attrition is where rocks being carried by the sea are knocked against each other, becoming smaller and rounder over time.
Solution is where sea water dissolves certain types of rocks, such as chalk or limestone.
This links into transportation - which is the movement of beach material.
Solution is when the minerals from these dissolved rocks are carried in solution in the sea water.
Suspension is where small particles are suspended in the flow of water.
Saltation is where small pieces of sediment that are too heavy to be suspended are bounced along the sea bed.
And traction is where larger sediment that is too heavy to be picked up is rolled along the sea bed.
Longshore drift describes the movement of sediment along the coast by waves. The direction of the prevailing wind results in waves approaching the coast at an angle. The swash carries material up the beach at this angle, but the backwash flows back to the sea at right angles to the cliff. This results in a sawtooth pattern where sediment is carried along the coast in the prevailing wind direction.
Deposition is when sediment material is dropped onto a beach, in other words, it is deposited. This happens when waves have low-energy, known as constructive waves. Deposition usually happens in sheltered areas due to slower waves, shallower water and little or no wind.
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GCSE Geography
09/05/2023
Keducate

[@islaedoran]

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[@tropicalland4552]

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[@CaspaVera]

Thanks to the person who created this app❤❤