Erosion
- Created by: Ella Norman
- Created on: 20-04-14 11:00
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- Erosion
- Marine erosion can be from wind, ice, river, human activity of the sea.
- Types of erosion
- Abrasion
- where rocks are hurled at the cliff face and the load wears it away
- Hydraulic Action
- when water is forces air into cracks and crevices, gradually wearing the rock away
- Attrition
- the load collides and grinds away causing sand to form
- Solution
- particles dissolve in the river
- Abrasion
- Factors controlling the rate of erosion
- Coastal factors
- rock type - softer rock erodes more
- rock structure - weaknesses like joints are more easily eroded
- rock trend - concordant or discordant coastline
- angle of dip of the beds - towards the sea means more resistant
- shelter from islands, headlands - energy is absorbed
- size of beach and coastal vegetation - absorb wave energy
- relief - higher areas are more exposed to other processes
- Marine factors
- depth of water - when the water is deeper there is more energy
- wave energy - the bigger the fetch, the more energy
- tides - small tidal range means more erosion
- direction of prevailing winds and storm frequency
- amount of load carried
- rising sea level
- the role of human activity
- level of coastal protection
- Coastal factors
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