The cross section of a valley resembles the letter 'V'.
They are found in the upper course (mountainous) part of a river. The river has very little energy to erode sideways (laterally) in this section, however it does erode downwards (vertically).
This vertical erosion creates a steep narrow gorge, the sides of the gorge are attacked by weathering and broken down. The sides of the gorge are made less steep by the weathering creating a V shape.
This vertical erosion creates a steep narrow gorge, the sides of the gorge are attacked by weathering and broken down. The sides of the gorge are made less steep by the weathering creating a V shape.
* River erodes downwards
*Vertical eroisen
*A deep gorge is formed
* Rock fragments are weathered
* Some rock falls into the river
* Sides of the valley steepen
* The result is a V-Shaped Valley
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