The 'graded profile' of a river course is a (1) smooth curve from source to mouth (2) smooth curve in the upper course. (3) smooth curve in the middle course. (4) smooth curve in the lower course.

The 'graded profile' of a river course is a (1) smooth curve from source to mouth (2) smooth curve in the upper course. (3) smooth curve in the middle course. (4) smooth curve in the lower course.
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(1) smooth curve from source to mouth Explanation: The course of a river from its source to its mouth is normally divided into 3 sections, namely upper, middle and lower courses. Action of the river on its valley from source to mouth in relation to the features developed by it is seen in the river valley profile, known as graded profile. Throughout the long profile of a river, deposition and erosion are balanced meaning that, given enough time, the river's long profile would become a smooth, concave, graded profile from its source to mouth.
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