Explanation

(a) Landforms found in the upper course of a river are gorge, v-shaped valley, and waterfall

(b) Characteristics of an ox-box lake landform,feature of lower course of a river occurs in marshy areas horse-shoe in shape shallow convex bank deep concave bank.Formation of an ox-bow lake formed in the lower course of a river, formed due to pronounced meanders, erosion on the concave bank, deposition on the convex bank, neck becomes very narrow, river breaks through the narrow neck during floods, leads to deposition of sediment at the entrance of the loop results in a cut off lake called ox-bow lake.

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