Differentiate between V-shaped valley and U-shaped valley.

The differences:
V-shaped valley:

1. V-shaped valleys are carved out by the river in their youthful stages.

2. They are original in nature, i.e. they are formed by the erosional actions of the rivers.

3. Their shapes are of the letter ‘V’ of english alphabet.

4. They are associated with gorges, canyon etc.
U-shaped valley: 

1. U-shaped valleys are casual by glaciers in hilly regions.

2. They are modified form of pre-existing valleys.

3. Their shapes are that of the letter ‘U’ of the English alphabet.

4. They are associated with hanging valleys.