(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.
(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
Contributions ({{ comment_count }})
Please wait...
Modal title
Report
Block User
{{ feedback_modal_data.title }}