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Explain the processes involved in the formation of a waterfall

I wrote an answer to this 6 mark question, and I'm going to ask my teacher to mark it, but can somebody give me some feedback? Any improvements? By the way, I'm currently doing GCSE geography under AQA.

-A waterfall is an erosional landform that occurs upstream when there is a horizontal layer of hard rock on top of a layer of softer rock.
-Erosional processes such as hydraulic action (the force of the river compressing air in rock cracks and consequently breaking bits off) occur as the river flows downstream.
-Differential erosion takes place, because of the soft rock being less resistant, and the hard rock is left overhanging over time.
-The hard band of rock can no longer support itself and breaks off, adding more material for erosion in the plunge pool at the base of the waterfall.
-This process continues upstream, forming a steep sided gorge as it goes.
A fairly solid response to the question. I would add that as the soft band of rock is eroded away at the riverbed, a notch forms and this increases the velocity of the river (by decreasing friction), thereby exacerbating erosion vertically and creating a steep fall.
Original post by naem071
A fairly solid response to the question. I would add that as the soft band of rock is eroded away at the riverbed, a notch forms and this increases the velocity of the river (by decreasing friction), thereby exacerbating erosion vertically and creating a steep fall.

thank you! I'll remember that for next time
Hi, this might sound weird but I'm doing the same question and I wanted to ask how many marks did you get?

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