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2021 WAEC Geography Practical (a) List three landforms associated with coastal erosion. (b) Explain the following processes of wave...

Geography
WAEC 2021


(a) List three landforms associated with coastal erosion.

(b) Explain the following processes of wave erosion:

(i) hydraulic action:

(ii) COrrasion 

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Explanation

(a) Landforms associated with coastal erosion:

- Arch
- Stack
- Headland
- Offshore terraces
- Coastal plain
- Bay
- Caves
- Capes or promontories
- Hanging valley
- Cliff
- Blowholes/gloups
- Geo/inlet
- Wavecut platform.

(b) Processes of wave erosion:

(i) Hydraulic action:
- Action of moving water
- Wearing down of coastal landforms
- Takes place on coastal rocks and river beds
- Due to sheer force of water
- Starts with coastal rock developing cracks
- Waves throw water against the cracked rocks
- Air is trapped in cracks
- Trapped air is compressed by the force of the wave
- On the retreat of waves the compressed air expands
- The process repeats itself multiple times
- The expansion is with Blow Stump
-This process is hydraulic action

(ii) Corrasion:

- Erosive action of running water
- Common in the upper and middle course of rivers
- Running water carries load
- The load could be boulders, pebbles, and other rocks fragments
- The rocks materials act as scouring tools
- They are hauled against the coastal rocks, to form other landform features. 
- The rate of erosion also depends on the level of resistance of the coastal rocks


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