Physical Geography in English Stages of A RIVER. The river can be fast flowing and is energetic and wears down its rock and boulder bed. The Long Profile Of A River Internet Geography There are three stages in the course of a river. . This is a valley whose typical cross-section is shaped like a v a cross-section is the shape that you would walk if you walked down. There are three main stages of a stream. Nearly all rivers have an upper middle and lower course. The channel is U-shaped and wider than a youthful river yet deeper than an old age channel due to moderate downcutting but also lateral side-to-side erosion. The three stages in a river or streams development are youthful mature and old. This lesson is part of Investigating Rivers a unit designed for upper KS2 Y4-6. The table below explains the main features of each stage. It forms large bends called meanders. In this stage the river flows through s
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