fill in the gaps: of explaining the formation of a waterfall many waterfall form when rivers meet a band of softer, _______ ____________ rock after flowing over a relatively _______ ____________rock. The underlying ______ rock is worn away more _________, (erosion by abrasions and hydraulic action) ___if doing 6 marker________________________________. and the harder rock is __________. In _________ the overlying harder rock will become ____________ and will ___________. After its collapse, some of the rock will be swirled around by the river, especially during times of high ________, to form a deep _______ _________. This process is likely to be repeated many times, causing the waterfall to ___________upstream.

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