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- Valleys with V, open V or U shaped cross sections along the river channel.
o In the source region a river cuts itself a channel which starts as a gulley.
o The channel is deepened by vertical erosion resulting into a v-shaped valley.
o In the middle stage lateral erosion widens and deepens the valley resulting in a more open v-cross section.
o In the old stage lateral erosion creates a very wide channel with a U-shaped cross section.
Kavungya answered the question on May 4, 2019 at 08:43
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