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Weathering and water erosion wear away at the slopes which would then collapse downwards into the river and the process would continue, expanding until it becomes a river valley. Try googling 'formation of a river valley' and look at a diagram.

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10y ago
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14y ago

rivers and streams usually make v shaped valleys and glaciers make the v turn into a u shaped valley

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15y ago

Glaciers, mostly Glaciers Melting

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Q: What two processes are responsible for the formation of a valley?
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