: A waterfall forms when a river meets a band of softer rock, The softer rock is eroded away more easily by processes such as abrasion, The more resistant rock is left unsupported and eventually collapses onto the river bed, Hydraulic action and abrasion help to create a deep plunge pool, The process is repeated and the waterfall retreats upstream, A steep sided valley called a gorge is created as the waterfall retreats,

KS3 How is a waterfall formed?

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