Assess the importance of Lithology in influencing the rate of coastal erosion. (12 marks)
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- Created on: 19-02-18 16:38
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- Assess the importance of Lithology in influencing the rate of coastal erosion. (12 marks)
- Lithology
- Reactivity
- HIGHLY REACTIVE
- A reactive rocky type is more susceptible to chemical weathering eg. Limestone
- HIGHLY REACTIVE
- Clastic or Crystaline?
- CLASTIC
- When the rocks are made up of smaller broken rocks they're more easily eroded
- CRYSTALINE
- These are formed in interlocking crystals which is much harder to erode
- CLASTIC
- Weaknesses
- If there are species in the rocks then they can make cracks within the rocks which increase the amount of weaknesses
- Eg. Clams
- WEAKNESSES
- Weaknesses within the rocks mean that water can get into the cracks and erode outwards
- NOT MANY WEAKNESSES
- With only a few cracks it is harder for the water get into the cracks and make the larger
- If there are species in the rocks then they can make cracks within the rocks which increase the amount of weaknesses
- Reactivity
- Vegetation
- Binds Unconsolidated Sediment together
- Unconsolidated sediment is easily eroded, the binding makes it stronger
- Binds Unconsolidated Sediment together
- Prevalence of Species
- Biological Weathering
- If there are species in the rocks then they can make cracks within the rocks which increase the amount of weaknesses
- Eg. Clams
- Plant species can also drop sees into the cracks which grow and create weaknesses
- If there are species in the rocks then they can make cracks within the rocks which increase the amount of weaknesses
- Biological Weathering
- Geological Structure
- Strata
- Deformation
- FAULTING
- Faults allow water to fill the gaps and erode
- Pore Water Pressure
- Permeability and porosity
- PERMEABLE
- A permeable rock will allow water to flow through easily which means that it is eroded in the gaps as well as from the outside
- A rock is permeable if it is Porous
- A permeable rock will allow water to flow through easily which means that it is eroded in the gaps as well as from the outside
- PERMEABLE
- HIGH PRESSURE
- Permeability and porosity
- Season
- WINTER
- Destructive Waves- Berms are eroded by plunging waves
- SUMMER
- Constructive waves tend to deposit more sediment than they erode
- WINTER
- KEY
- Increses rates of Erosion
- Decreases rates of Erosion
- Lithology
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