High altitude snowy mountain peak. Dangerous summit and cliffs. U-shaped shape trough troughs valleys, with steep, straight sides and a flat or rounded bottom (carved V-shaped in cross-section). Glaciated down a slope carving the valley by the action of scouring. A tarn (or corrie loch) is a mountain lake or pool, formed in a cirque excavated by a glacier. A moraine may form a natural dam below a tarn. Erodes the land, and then melts, filling the hole or space that it has created. These lakes surrounded by drumlins, along with other evidence of the glacier such as moraines, eskers and erosional features striations and chatter marks. Alpine alp climate highland sediment sediments crater mountainous hilly peaks sharp rocky rock wall summits snow ice moraine cliff fly flying glaciation. 4K UHD 3840×2160 30p.