How is U shaped valley formed?

(A) Glacier
(B) Breaking waves
(C) Sea waves
(D) River in mountainous stage

Correct Answer : Glacier
Question Asked : OPSC OCS Pre. Exam 2018
U-shaped valleys or glacial troughs are formed by the process of glaciation. They are characteristic of mountain glaciation. They have a characteristic U-shape with steep, straight sides and a flat or rounded bottom.
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