What work are rivers involved in when they come from northern mountains and what feature does it form in the lower course?

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Solution

You can understand this question by following points:
Upper course mostly have erosional features because of high velocity of water.
Erosional features :Waterfall, V shape valley,spurs, gorges,plunge pool

Middle course also forms erosional features because of high velocity of water.
Erosional features:Meanders, oxbow lake
Depositional features:Levees

Lower course mostly form depositional features because of low velocity
Depositional features:Deltas, flood plains, levees, meanders, ox-bow lakes.

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