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river erosion

QuestionAnswer
what are waterfalls? waterfalls are vertical interruptions in the rivers profile that occur due to vertical erosion in the youthful stage
examples torc waterfall powerscort waterfall
How do waterfalls occur occur where a band of hard rock lies upstream of soft rocks
how do they erode rock river has a high velocity and therefore large erosive power which vertically erodes the river bed
what is differential erosion the soft rock is eroded faster than the hard rock.
how does hydraulic action erode the water bed The swirling water carves out out hollows across the river bed through hydraulic action
whats abrasion broken rocks become trapped in hollows causing them to deepen and widen.
The rate of hydraulic action is increased. Its impact shatters the rock at the base creating a plunge pool
hydraulic action and abrasion widen the plunge pool causing it to erode backwards this is known as undercutting
what is an overhang as undercutting continues the layer of hard rock is left elevated
eventually the overhang becomes unstable and collapses which increases the rate of abrasion
how is a gorge created as undercutting and collapsing continues the waterfall gradually retreats upstream which is known as headward erosion which creates steep sided valleys
Created by: Megan k
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