A Rivers Long Profile and Cross Profile Vary Over its Course
1) The path of a river it flows downhill is called its course.
2) Rivers have an upper course (closest to the source of the river), a middle course and a lower course (closest to the mouth of the river).
3) Rivers form channels and valleys as they flow downhill.
4) They erode the landscape - wear it down, they transport the material to somewhere else where its deposited.
5) The shape of the valley and channel chages along the river depending on whether erosion or deposition is having the most impact (is the dominant process).
6) The long profile of a river shows you how the gradient (stepness) changes over the different courses.
7) The cross profile shows you what a cross-section of the river looks like.
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