The way that a river could change its valley faster is through river erosion.
How river erposion may lead to a change in valley
When a river is running through slopes that are steep, there would be the occurence of vertical erosion.
This erosion would cut the river bed and then cause a v shaped valley. When the river gets to flow towards the mouth, the steeps would not be as slopy.
Read more on rivers here: https://brainacademy.pro/question/908462
The way that a river could change its valley faster is through river erosion.
How river erposion may lead to a change in valley
When a river is running through slopes that are steep, there would be the occurence of vertical erosion.
This erosion would cut the river bed and then cause a v shaped valley. When the river gets to flow towards the mouth, the steeps would not be as slopy.
Read more on rivers here: https://brainacademy.pro/question/908462