Do waterfalls and rapids occur where rivers meet and flow over hard rocks?

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Physics

Jorge Palmer

28 March, 02:43

Do waterfalls and rapids occur where rivers meet and flow over hard rocks?

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Tia Hodge · Answer 1

Waterfalls occur when there is a sudden drop. For example the land may be 40ft up, but then suddenly it drops to 10ft above sea level. Rapids occur when the water is running through a downhill slope with a bunch of rocks.