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Frost is a thin layer of ice on a solid surface, which forms from water vapor in an above-freezing atmosphere coming in contact with a solid surface whose temperature is below freezing, and resulting in a phase change from water vapor to ice as the water vapor reaches the freezing point. In temperate climates, it most commonly appears on surfaces near the ground as fragile white crystals; in cold climates, it occurs in a greater variety of forms. The propagation of crystal formation occurs by the process of nucleation.
A glacier is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. Glaciers slowly deform and flow under stresses induced by their weight, creating crevasses, seracs, and other distinguishing features. They also abrade rock and debris from their substrate to create landforms such as cirques, moraines, or fjords. Glaciers form only on land and are distinct from the much thinner sea ice and lake ice that forms on the surface of bodies of water.
Snow comprises individual ice crystals that grow while suspended in the atmosphere—usually within clouds—and then fall, accumulating on the ground where they undergo further changes. It consists of frozen crystalline water throughout its life cycle, starting when, under suitable conditions, the ice crystals form in the atmosphere, increase to millimeter size, precipitate and accumulate on surfaces, then metamorphose in place, and ultimately melt, slide or sublimate away.
A snowball is a spherical object made from snow, usually created by scooping snow with the hands, and pressing the snow together to compact it into a ball. Snowballs are often used in games such as snowball fights.
An avalanche is a rapid flow of snow down a slope, such as a hill or mountain.
Snowshoes are specialized outdoor gear for walking over snow. Their large footprint spreads the user’s weight out and allows them to travel largely on top of rather than through snow. Adjustable bindings attach them to appropriate winter footwear.
Ski mountaineering is a skiing discipline that involves climbing mountains either on skis or carrying them, depending on the steepness of the ascent, and then descending on skis. There are two major categories of equipment used, free-heel Telemark skis and skis based on Alpine skis, where the heel is free for ascents, but is fixed during descent. The discipline may be practiced recreationally or as a competitive sport.
A hoof, plural hooves or hoofs, is the tip of a toe of an ungulate mammal, strengthened by a thick and horny keratin covering.
The tutu is a dress worn as a costume in a classical ballet performance, often with attached bodice. It may be made of tarlatan, muslin, silk, tulle, gauze, or nylon. Modern tutus have two basic types: the Romantic tutu is soft and bell-shaped, reaching the calf or ankle; the Classical tutu is short and stiff, projecting horizontally from the waist and hip.
Wellington was a small unincorporated railroad community in the northwest United States, on the Great Northern Railway in northeastern King County, Washington.
Artificial hair integrations, more commonly known as hair extensions, hair weaves, and fake hair add length and fullness to human hair. Hair extensions are usually clipped, glued, or sewn on natural hair by incorporating additional human or synthetic hair. These methods include tape-in extensions, clip-in or clip-on extensions, fusion method, weaving method, and wigs.
The Dyatlov Pass incident was an event in which nine Russian hikers died in the northern Ural Mountains between 1 and 2 February 1959, in uncertain circumstances. The experienced trekking group from the Ural Polytechnical Institute, led by Igor Dyatlov, had established a camp on the eastern slopes of Kholat Syakhl. During the night, something caused them to cut their way out of their tent and flee the campsite while inadequately dressed for the heavy snowfall and subzero temperatures.
Graupel, also called soft hail, corn snow, hominy snow, or snow pellets, is precipitation that forms when supercooled water droplets are collected and freeze on falling snowflakes, forming 2–5 mm (0.08–0.20 in) balls of crisp, opaque rime.
Layered clothing is a term describing a way of dressing using many garments that are worn on top of each other. Some of the layers have different, largely non-overlapping, functions. Using more or fewer layers, or replacing one layer but not others, allows for flexible clothing to match the needs of each situation. Two thin layers can be warmer yet lighter than one thick layer, because the air trapped between layers serves as thermal insulation. Layered clothing is particularly relevant in cold climates, where clothing must at the same time transfer moisture, provide warmth, and protect from wind and rain. In a hot and dry climate, clothes have very different functional requirements: they must block the radiation from the sun, and allow for sufficient air circulation. Therefore, layered clothing in the sense used in this article is largely irrelevant in hot and dry climates. The wicking layer moves the sweat from your skin, where it can be absorbed by the other layers.
Mount Hood climbing accidents are mountain climbing- or hiking-related incidents on Oregon's Mount Hood. As of 2007, about 10,000 people attempt to climb Mount Hood each year. As of May 2002, more than 130 people have died climbing Mount Hood since records have been kept. One of the worst climbing accidents occurred in 1986, when seven teenagers and two school teachers froze to death while attempting to retreat from a storm.
Avalanche control or avalanche defense activities reduce the hazard avalanches pose to human life, activity, and property. Avalanche control begins with a risk assessment conducted by surveying for potential avalanche terrain by identifying geographic features such as vegetation patterns, drainages, and seasonal snow distribution that are indicative of avalanches. From the identified avalanche risks, the hazard is assessed by identifying threatened human geographic features such as roads, ski-hills, and buildings. Avalanche control programs address the avalanche hazard by formulating prevention and mitigation plans, which are then executed during the winter season. The prevention and mitigation plans combine extensive snow pack observation with three major groups of interventions: active, passive and social - sometimes more narrowly defined as "explosive", "structural", and "awareness" according to the most prevalent technique used in each. Avalanche control techniques either directly intervene in the evolution of the snow pack, or lessen the effect of an avalanche once it has occurred. For the event of human involvement, avalanche control organizations develop and train exhaustive response and recovery plans.
In common with many of the neighboring lakes in the Eagle Cap Wilderness of the Wallowa-Whitman National Forest in Wallowa County, Oregon, Aneroid Lake is nestled in an example of a cirque valley with large tarn scoured out of the mountain side by glacial movements during the Pleistocene. Located at the southern foot of Bonneville Mountain the lake and its basin form the headwaters of the East Fork Wallowa River. Aneroid Mountain, namesake of the lake, is about 1.5 miles (2.4 km) to the east, while Roger Lake lies in between a mere .5 miles (0.80 km) away. Dollar Lake is 1.5 miles (2.4 km) to the southeast and Pete's Point 1.5 miles (2.4 km) slightly to the southwest. Because the lake is within the boundaries of the Eagle Cap Wilderness protection area it is inaccessible by any motorized vehicle or any other mechanized mode of travel. However, there is a popular hiking trail for horse and foot traffic. A small group of private cabins that predate the wilderness designation are located beyond the south end of the lake. Aneroid Lake ties with Laverty Lake for the twenty-third highest lake in the Eagle Cap Wilderness at 7,500 ft (2,300 m) elevation.
Avalanche rescue involves locating and retrieving people who have been buried in avalanches.
The Amazonis quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Amazonis quadrangle is also referred to as MC-8.
Classifications of snow describe and categorize the attributes of snow-generating weather events, including the individual crystals both in the air and on the ground, and the deposited snow pack as it changes over time. Snow can be classified by describing the weather event that is producing it, the shape of its ice crystals or flakes, how it collects on the ground, and thereafter how it changes form and composition. Depending on the status of the snow in the air or on the ground, a different classification applies.
References
- ↑ "Loose Snow Avalanche". 2011-01-21. Archived from the original on 2011-01-21. Retrieved 2021-04-19.
- ↑ "Loose Snow Avalanches". 2010-12-20. Archived from the original on 2010-12-20. Retrieved 2021-04-19.
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