Why is an area without trees more likely to have an avalanche than an area with trees?
Answers
ANSWER:
because Falling masses of snow and ice, avalanches pose a threat to anyone on snowy mountainsides. Beautiful to witness from afar, they can be deadly because of their intensity and seeming unpredictability.
Humans trigger 90 percent of avalanche disasters, with as many as 40 deaths in North America each year. Most are climbers, skiers, and snowmobilers. Learning about avalanches, and the conditions that cause them, can help people recreate more safely in the backcountry.
Types of avalanches
The recipe for an avalanche may seem simple: a mountain slope and a thick layer of snow. But Simon Trautman, an avalanche specialist at the U.S. Forest Service’s National Avalanche Center and Northwest Avalanche Center in Washington, says it’s actually a trifecta that causes avalanches: terrain, snowpack, and weather conditions. Avalanches do occur naturally, but when you add humans into the mix, they can be deadly, says Trautman.
Avalanches come in many shapes and sizes. Many are small slides of powdery snow that move as a formless mass downslope. Outdoor recreationists often trigger these small “sluffs,” as well as more medium-sized avalanches.
Disastrous avalanches occur when massive slabs of snow break loose from a mountainside. The mass of snow shatters like broken glass as it races downhill. These hazards can travel as fast as cars on a freeway, up to 100 miles per hour, says Trautman.
Snow slides can start on mountain slopes with at least a 30-degree incline, but they occur most frequently on slopes of 35-50 degrees. Although avalanches need a slope...
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