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erosional landforms, depositional landforms - Coggle Diagram
erosional landforms
headlands and bays
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Headlands and bays are caused when there is a discordant coastline, this discordant coastline has its rock structure at a 90 degree angle to the waves, this means that different parts of the coastline will have different rates of erosion. Parts with soft rocks will have a lot of erosion making a bay, in the other hand there will be hard rock that won't get as much erosion ad will persist as a headland.
from crack to stump
- cracks: over time headlands accumulate weak spots where cracks are formed.Waves get in these cracks and erode them through hydraulic action and abrasion
- cave: after the repeated erosion to a crack the crack starts to get bigger and then eventually it becomes a cave
- arch: when 2 caves form on oposite side of each other in a headland form continued erosion will break down the wall separating the 2 caves eventually combining them and forming an arch
- stack: The top of an arch gets eroded continually until it can't hold anymore making it fall due to gravity, this will leave a stack
- stump: The continued erosion at the base of the stack will cause the top of the formation to fall leaving behind the stump, which is the base of the stack.
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wave cut notches
In areas of fairly hard resistant rock, you may see cliffs and a feature known as a wave cut platform. At high tide, the waves attack the base of the cliff and undercut it to forma wave cut notch. After time, the cliff above the notch collapses as it has lost its support. This is only exposed at low tide.
depositional landforms
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spits
- There is a beach with a change of direction. The sediment moves up the beach in a zig-zag motion.
2.When there is a change of direction of the castline the eroded material that has been carried from the beach gets deposited at the change of direction
3.The continued deposition and accumulation of the eroded materials from longshore drift in calm waters will form a spit
4.The prevailing wind will cause the end of the spit to be curved . this results on the final stage of the split.
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If a spit develops in a bay, it may build across and link the 2 headlands to form a bar.
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