Explanation

(a) Corrasion/abrasion, solution/corrosion, hydraulic action

(bi) upper course:- *Marks the beginning or source of a river
                              *occurs in highland areas
                              *main river flows swiftly down the steep slopes
                              *headward erosion also occurs

(ii) middle course:- *lateral erosion is dominant over vertical erosion
                              *valleys are widened
                              *increased load of the river
                              *dominant work is transported 

(iii) lower course:- *main work is deposition 
                             *there is active lateral erosion 
                             *increased volume of rivers from addition by tributaries
                             *speed of the river is greatly slackened 

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