Erosional work of glacier

Erosion by glaciers is tremendous because of friction caused by sheer weight of the ice. As a glacier moves over the land, it drags rock fragments, gravel and sand along with it. These rock fragments become efficient erosive tools. With their help glacier scrapes and scours the surface rocks with which it comes in contact. This action of glacier leaves behind scratches and grooves on rocks. Glaciers can cause significant damage to even un-weathered rocks and can reduce high mountains into low hills and plains.