arête

Concept of glacier. Formation and movement of glacier. Continental, valley, and piedmont glaciers. Glacier erosion: cirque, horn, U-shaped valley, arête, hanging valley and Roche moutonnee.

川的念、形成和川的运动。大陆川、山岳川、山麓川。川侵地貌：斗、角峰、和U形谷、脊和悬谷以及羊背石。川搬运和。期。