Solution - acids in the water dissolves soluble bedrock., Abrasion - force of the water throws bed load against the riverbanks causing a scouring action, Hydraulic action - water compresses air into the riverbank causing materials to be dislodged, Attrition  - is when load is thrown against other particles in the water causing it to become smaller and rounder, Freeze thaw weathering - The sides of a V-shaped valley are exposed to this process., Interlocking Spurs - Rivers in a v-shaped valley flow around these. , Rocks are transported downstream. - This makes the river channel wider and deeper., Vertical erosion - This is the main direction in which rivers in the upper course erode the landscape,

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