river erosion
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| what are waterfalls? | waterfalls are vertical interruptions in the rivers profile that occur due to vertical erosion in the youthful stage
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| examples | torc waterfall powerscort waterfall
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| How do waterfalls occur | occur where a band of hard rock lies upstream of soft rocks
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| how do they erode rock | river has a high velocity and therefore large erosive power which vertically erodes the river bed
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| what is differential erosion | the soft rock is eroded faster than the hard rock.
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| how does hydraulic action erode the water bed | The swirling water carves out out hollows across the river bed through hydraulic action
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| whats abrasion | broken rocks become trapped in hollows causing them to deepen and widen.
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| The rate of hydraulic action is increased. Its impact shatters the rock at the base creating a plunge pool
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| hydraulic action and abrasion widen the plunge pool causing it to erode backwards this is known as undercutting
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| what is an overhang | as undercutting continues the layer of hard rock is left elevated
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| eventually the overhang becomes unstable and collapses which increases the rate of abrasion
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| 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
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Created by:
Megan k
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