BBC - KS3 Bitesize Geography - Rivers and flooding : Revision, Page 6

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Geography

Rivers and flooding

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** River landforms **

*Landforms in the upper course*

-V-shaped valley-

When a river is near its source, it often develops a V-shaped valley as the
river erodes down (this is called vertical erosion [*vertical erosion*:
/When the land is eroded or worn away in a downwards direction, eg a river
that is high up will erode vertically because gravity pulls the water
downwards./] ). At the same time, weathering breaks up material on the
valley slopes. Weathered material from the valley sides gets deposited in
the river. This material is carried by the river and erodes the riverbed
through abrasion.

-Waterfalls-

Waterfalls often form in the upper stages of a river where it flows over
different bands of rock. It erodes soft rock more quickly than hard rock
and this may lead to the creation of a waterfall.

*Formation of a waterfall:*

· The soft rock erodes more quickly, undercutting [*undercutting*:


Source: www.bbc.co.uk/bitesize/ks3/geography/physical_processes/rivers_flooding/revision/6/


how is a v shaped valley formed

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