Question

What happens to the velocity and volume of a river as it moves from upper coarse to lower coarse

Answer 1

as the river flows downhill there is an increase in vertical erosion. The channel is shallow and narrow because there is not a lot of water in the channel.

B – as the river flows into the middle course, there is some vertical erosion but more lateral erosion. The channel is wider and deeper as a result.

C - in the lower course there is a lot less erosion, with only some lateral erosion. The channel is at its widest and deepest.