Question

6. In the upper course, the river cuts a deep and narrow channel in the mountains.​

Answer 1

Answer:

As the river moves through the upper course ,it's cuts downwards.Vertical erosion in this Highland part of the river helps to create steep sided V shaped valleys ,interlocking spurs,rapids,waterfall and gorges.As the river erodes the landscape in the upper course ,it winds and bends to avoid areas of hard rock.

As the river stretches dowmstream both it's velocity and discharge increases.Its velocity increase due to more efficient flow and reduced channel roughness.As a result of this increased discharge river ,in its attempt to balance its energy erodes laterally ,widening as well as deepening the channel.