(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.....Read more
