ChestertonCC - Geo - Rivers - 7-5 waterfall formation

Where do waterfalls form?

• Upper course

• Middle course

• Lower course

Waterfalls form where a river flows over an area of stronger rock, then weaker rock

• True

• False

The river erodes the weaker rock ______ than the stronger rock.

• Faster

• Slower

The river erodes the weaker rock more quickly, _____ the stronger rock

• Undercutting

• Overhanging

• Plunge pool

• Retreating

The stronger rock is left _____ because it isn't supported. Eventually, it collapses.

• Undercutting

• Overhanging

• Plunge pool

• Retreating

The rocks crash into the _____ underneath the waterfall.

• Undercutting

• Overhanging

• Plunge pool

• Retreating

Over hundreds of years, these steps repeat, so the waterfall moves _____.

• Upstream

• Downstream

As the waterfall moves upstream, a steep-sided _____ is left.

• Undercut

• Overhang

• Plunge pool

• Gorge