The features that result as a form of a glacier carving out rock and forms into the landscape over which it slides are called cirques. When a glacier moves it erodes the surface of the earth beneath it. In this process of erosion large boulders and very small pebbles all get caught up in the path of the glacier and move along with it. This moment causes deep depressions into the earth, changing the landscape. The deposition of rocks and silt from a melting glacier also changes the form of the land over which the glacier moves.