_______is the main work of a river in upper course.
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In the upper course , the river carries sediments which are deposited layer by layer over period of time. Thus apart from having a fertile alluvial soil, they also help in land formation
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The main function of a river in its upper course is erosion. It erodes its bed and banks and carries large boulders of rock with it.
The landforms formed in the upper course of a river are V-shaped valley and waterfall.
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