<P> U-shaped valleys , trough valleys or glacial troughs , are formed by the process of glaciation . They are characteristic of mountain glaciation in particular . They have a characteristic U shape , with steep , straight sides and a flat or rounded bottom ( by contrast , valleys carved by rivers tend to be V - shaped in cross-section ) . Glaciated valleys are formed when a glacier travels across and down a slope , carving the valley by the action of scouring . When the ice recedes or thaws , the valley remains , often littered with small boulders that were transported within the ice , called glacial till or glacial erratic . </P>
<P> U-shaped valleys , trough valleys or glacial troughs , are formed by the process of glaciation . They are characteristic of mountain glaciation in particular . They have a characteristic U shape , with steep , straight sides and a flat or rounded bottom ( by contrast , valleys carved by rivers tend to be V - shaped in cross-section ) . Glaciated valleys are formed when a glacier travels across and down a slope , carving the valley by the action of scouring . When the ice recedes or thaws , the valley remains , often littered with small boulders that were transported within the ice , called glacial till or glacial erratic . </P>
what type of glacier forms a u shaped valley
what type of glacier forms a u shaped valley
mountain glaciation
mountain glaciation