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In the upper course of the river the river is beginning so is narrow, shallow and low energy. This low energy causes sediment to not move and therefore pebbles and rocks aren't moved by the waters action....
Weathering is the breakdown and decay of rocks in-situ (where they originally lie) whereas erosion is the active removal (transportation) of weathered fragments.
Cutting down forests destroys the habitats of animals within the forest, which would reduce the number of animals living there along with decreasing the biodiversity. Another possible environmental impact...
Erosion, weathering, transportation and deposition.
There are four main types of river erosion. You can have hydraulic action, attrition, abrasion and solution.
Hydraulic action is the power that the water has to simply break away bits of the river...
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