11.3 River erosion landforms Flashcards Preview

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Flashcards in 11.3 River erosion landforms Deck (4)
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1
Q

What type of landforms are common at the river’s upper course?

A

➢ Interlocking spurs
➢ Waterfalls
➢ Gorges

2
Q

How are interlocking spurs formed?

A

➢ The river near the source of the river is not powerful enough to cut through the hard rock, so flows around them to form spurs

3
Q

How are waterfalls formed?

A

➢ When the river flows over a relatively resistant band of hard rock
➢ The river plunges of a waterfall it forms a deep and turbulent plunge pool
➢ The processes of erosion such as hydraulic action and abrasion combine to undercut the waterfall
➢ Eventually, the overhanging rock collapses and the waterfall retreats upstream

4
Q

What is a gorge?

A

➢ A narrow steep-sided valley that is usually found immediately downstream of a waterfall
➢ Formed by the gradual retreat of a waterfall

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