How can you tell the difference between young and old river?

There are a few key ways to tell the difference between a young and old river:

- Valley shape: A young river will typically have a V-shaped valley, while an old river will have a U-shaped valley. This is because a young river is still actively cutting down into the land, while an old river has had time to widen its valley.

- Gradient: A young river will typically have a steeper gradient than an old river. This is because a young river is still flowing quickly and has not yet had time to erode away the land around it.

- Meanders: A young river will typically have fewer meanders than an old river. This is because a young river is still flowing relatively straight and has not yet had time to develop many bends.

- Erosion: A young river will typically cause more erosion than an old river. This is because a young river is still actively cutting down into the land and has not yet had time to develop a stable floodplain.

- Deposition: An old river will typically deposit more sediment than a young river. This is because an old river has had more time to slow down and deposit sediment on its floodplain.

Of course, there is some variation between rivers, and not all rivers will fit perfectly into these categories. However, these are some general guidelines that can help you tell the difference between a young and old river.