Rivers (erosional river landforms)

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  • Created on: 09-03-17 17:49
(Upper course) Waterfall step ONE
Waterfalls form when a river flows over an area of hard rock followed by an area of softer rock.
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Waterfall step TWO
The softer rock is eroded more than the hard rock, creating a step in the river.
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Waterfall step THREE
As water goes over the step it erodes more and more of the softer rock.
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Waterfall step FOUR
A steep drop is eventually created, which is called a waterfall.
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Waterfall step FIVE
The hard rock is eventually undercut by erosion. It becomes unsupported and collapses.
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Waterfall step SIX
The collaped rocks are swirled around the foot of the waterfall where they erode the softer rock by abrasion.
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Waterfall step SEVEN
Overtime more undercutting causes more collapses the waterfall will retreat leaving behind a steep sided gorge.
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Interlocking spurs step ONE
In the upper course of a river most of the river is vertically downwards. This creates steep sided V-shaped valleys.
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Interlocking spurs step TWO
The rivers aren't powerful enough to erode laterally they have to wind around the high hillsides that stick out into their paths onto either side.
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Interlocking spurs step THREE
The hillsides that interlock with each other as the river winds around them are called interlocking spurs.
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Other cards in this set

Card 2

Front

Waterfall step TWO

Back

The softer rock is eroded more than the hard rock, creating a step in the river.

Card 3

Front

Waterfall step THREE

Back

Preview of the front of card 3

Card 4

Front

Waterfall step FOUR

Back

Preview of the front of card 4

Card 5

Front

Waterfall step FIVE

Back

Preview of the front of card 5
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