Waterfalls are usually found near the source of a river. It forms when water falls on hard rock. When the water reaches soft rock, it erodes and over a long period of time, cuts into soft rock. This makes a cliff that water can topple. Over time, the soft rock gets worn away and eventually hard rock on it will give way to gravity. Over time, the waterfall will move upstream.A plunge pool is formed under the waterfall as the water falls hard on the river bed, eroding it.
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