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Waterfalls

Waterfalls form where a river bed crosses from hard rock to softer rock. The river wears down the softer rock and creates a step. The falling water erodes a hollow at the base called a plunge pool.


Spray from the waterfall may under-cut the step and eventually cause it to collapse. Over time, the waterfall may cut back into the hard rock, leaving a steep valley called a gorge.

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