Cross profile
The valley cross profile = view of the valley from one sie to another.
Valley cross profile of a river in an upland area = a v-shape, with steep sides + a narrow bottom.
Upper course: Dominant vertical erosion by the river= narrow steep-sided valley where the river occupies all of the valley
Middle course: Lateral erosion= widens the valley floor = distinct valley bluffs+ a flat floodplain.
Lower course: Lack of erosion+ reduced competence of the river= large-scale deposition + a very wide flat floodplain in which the valley sides = difficult to locate
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