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Waterfall - Coggle Diagram
Waterfall
Process of erosion- River
Hydraulic action
Erosion by the sheer of moving water
Abrasion
Material carried by the river erodes the bed and bank of the river.
Solution
Water dissolves rock
Differential erosion
Soft rock gets eroded much quicker than hard rock
Formed where a band of hard rock lies over a band of soft rock.
The processes of erosion begin to erode the soft rock.
When soft rock starts to be eroded by hydraulic action a step is formed.
Overtime abrasion and hydraulic action cause the step to deepen.
Increased velocity (speed) makes erosion occur faster.
The constant flow off watter forms a plunge pool at the base of the waterfall
Water splashes against the wall of soft rock in the plunge pool- eroding further.
Process called undercutting
Creates an overhang of hard rock
This overhand grows overtime, becoming unsupported
Eventually collapsing into the plunge pool
The river retreats upstream
Process called headward erosion
E.g Glencar Waterfall,Co Leitrim
Torc Waterfall Co.Kerry