Huge avalanche, near Tangnag, Khumbu region, Himalayas, Nepal, Asia

A sign about avalanche risk and acute mountain sickness in the Annapurna Sanctuary, Himalayas, Nepal, Asia

A member of the Scottish Avalanche Information Service demonstrates how to assess avalanche risk on Cairngorm in the Cairngorm National Park in Scotland, United Kingdom, Europe

A member of the Scottish Avalanche Information Service demonstrates how to use an avalanche probe on Cairngorm in the Cairngorm National Park in Scotland, United Kingdom, Europe

A member of the Scottish Avalanche Information Service looks at snow crystals to help assess avalanche risk on Cairngorm in the Cairngorm National Park in Scotland, United Kingdom, Europe

Mountaineers surviving atrocious conditions on Cairngorm, Scotland, United Kingdom, Europe

Equipment used by the Scottish Avalanche Information Service to assess avalanche risk in the Scottish mountains, Scotland, United Kingdom, Europe

Mountaineers surviving atrocious conditions on Cairngorm, Scotland, United Kingdom, Europe

Heavy snow in the French Alps, France, Europe

Heavy snow in the French Alps, France, Europe

Safety equipment for ski tours, Avalanche protection, Avalanche Transceiver, PIEPS, Hochgrat, Allgäu Alps, Germany, Europa

Group of people alpine skiing, powder skiing, avalanche assessment on a ski tour, risk management with groups, Vorderes Galmihorn, Obergoms, Berner Oberland, Switzerland

group ski touring, avalanche assessment on a skitour, risk management with groups, Heji Zwaechte, Obergoms, Berner Oberland, Switzerland

Telemark skier Art Pearce descends a backcountry slope near the Black Tusk peak in Garibaldi Provincial Park, near Whistler.