The 'graded profile' of a river course is a


A) smooth curve in the upper course

B) smooth curve in the middle course

C) smooth curve in the lower course

D) smooth curve from source to mouth

Correct Answer:
D) smooth curve from source to mouth

Description for Correct answer:
In general, the river's bed from source to its mouth makes a smooth curve known as graded profile. A river has a maximum gradient in its upper course, less in the middle and least in lower courses.

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