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A waterfall happens when a creek or river flows over a cliff. Waterfalls can be tiny, only a few inches high, or they can be many hundreds of metres high.
Waterfalls form when a river flows over rocks that are different hardness. The river will erode the softer rock faster than the harder rock, and over a long time a waterfall gradually appears.
Waterfalls form when a river flows over rocks that are different hardness. The river will erode the softer rock faster than the harder rock, and over a long time a waterfall gradually appears.