how a waterfall is formed

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  • explaining how a waterfall is formed
    • stage 1  band of more resistant rock lies over less resistant rocks
    • stage 2     less resistant rock is eroded more quickly, leaving a 'step' - the waterfall
    • stage 3   more resistant rock is undercut, forming an overhang
    • stage 4    overhang can no longer be supported, blocks of rock can fall down
    • stage 5 powerful fall of water erodes plunge pool using fallen rocks
    • stage 6       waterfall retreats upstream


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