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2014 WAEC Geography Practical (a) List three processes of river erosion (b) Outline four characteristics of each of the...

Geography
WAEC 2014

(a) List three processes of river erosion

(b) Outline four characteristics of each of the following sections of a river valley: (i) upper course (ii) middle course (iii) lower course.

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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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