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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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