Rivers – True or false

Rivers – True or false

Assessment

Interactive Video

Science, Biology

1st - 6th Grade

Hard

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Waterfalls typically form in the upper course of a river where hard rock overlays soft rock. The river erodes the soft rock more easily, creating a steep drop. Over time, the waterfall erodes the soft rock beneath the hard rock, forming an overhang that eventually collapses. This cycle causes the waterfall to move upstream, leaving a gorge behind.

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2 questions

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1.

OPEN ENDED QUESTION

3 mins • 1 pt

Describe the process that occurs after the overhang collapses.

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2.

OPEN ENDED QUESTION

3 mins • 1 pt

What geographical feature is left behind as waterfalls move backwards upstream?

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