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
Solution :
[d] A river profile is a curve which shows the slop of a river from source to mouth. A stream flowing over irregular terrain may have waterfalls, rapids and lakes along its course. Though the stream will wear away the Irregularities to leave a smoothly curving profile called a graded profile.
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