Kyle is camping in the Mount Hood National Forest, Oregon. His campsite is in a wide, U-shaped valley. The valley was most likely formed by _____.

1. a river
2. mass wasting
3. a glacier
4. a mudflow

Respuesta :

Glaciers form U-shaped valleys so the answer is glaciers
A glacier. In prehistoric times huge glaciers of ice moved slowly accross the continent forming U shaped valleys, unlike the V shaped valleys caused by rivers.