What do you mean by U-shaped valley?short answer.

Definition:

U-shaped valleys form through glacial erosion. Glaciation develops in established v-shaped river valleys where the ice erodes the surrounding rocks to create a “U” shaped valley with a flat bottom and steep sides. Glacier movement is driven by gravity. When the glacier melts, the landscape is transformed and the U-shaped valleys are clearly visible.

A valley that in the shape of the letter U can referred to as a U-shape valley.

is there multiple choice or do you need like an essay answer?

your answer is "graduates" hope this