Waterfalls and gorges

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Waterfalls and Gorges

1) Form where a river flows over an area of hard rock followed by an area of softer rock.

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

3)As the water goes over the step it erodes more and more of the softer rock.

4)A steep drop is eventually created,which is called a waterfall .

5)The hard rock is eventually undercut by erosion. It becomes unsupported then collapses.

6)Over time more undercutting causes more collapsing. This then causes the water fall to retreat creating a gorge.