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.