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A mountain is an elevated portion of the surface of a planet, generally with steep sides that show significant exposed bedrock. Although there are no universally accepted definitions, a mountain is usually considered higher than a hill. By definition, mountains are often thought of as being a landform which is higher than 2,000 feet (610 m). It may either have a limited summit area or be a smaller plateau with high elevation and steep sides. A few mountains are isolated summits, but most occur in mountain ranges.[page needed]
Mountains are formed through tectonic forces, erosion, or volcanism,[page needed] which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers.
High elevations on mountains produce colder climates than at sea level at similar latitude. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain and climate, mountains tend to be used less for agriculture and more for resource extraction, such as mining and logging, along with recreation, such as mountain climbing and skiing.
The highest mountain on Earth is Mount Everest in the Himalayas of Asia, whose summit is 8,850 m (29,035 ft) above mean sea level. The highest known mountain on any planet in the Solar System is Olympus Mons on Mars at 21,171 m (69,459 ft). The highest mountain on Earth from base to peak is Mauna Kea in Hawaii, which rises 9,330 m (30,610 ft) from its base at the bottom of the ocean; some scientists consider it to be the tallest on Earth. (Full article...)

The region between the current leading edge of the glacier and the moraines of latest maximum is called glacier foreland or glacier forefield. In the Alps this maximum was in 1850 and since then the region has become ice free due to deglaciation. Because of this relative recent development of vegetation and morphodynamic the glacier foreland differs considerably from the surrounding landscape. (Full article...)
Chaîne de la Selle (French pronunciation: [ʃɛn də la sɛl]) is a mountain range in Haiti, on the island of Hispaniola.
The range's Pic la Selle is the highest point of Haiti, at a height of 2,680 meters (8,793 feet) above sea level. (Full article...)

A bornhardt ( /ˈbɔːrnˈhɑːrt/) is a dome-shaped, steep-sided, bald rock outcropping at least 30 metres (100 ft) in height and several hundred metres in width. They are named after Wilhelm Bornhardt (1864–1946), a German geologist and explorer of German East Africa, who first described the feature.
While bornhardt was originally used to sometimes denote a type of inselberg (literally island mountain—an isolated dome in an otherwise flat landscape), the term bornhardt is used in modern literature to refer to domed hills and mountains regardless of isolation; thus, not all bornhardts are inselbergs and not all inselbergs are bornhardts. Bornhardts are commonly composed of igneous rocks, often granites, but examples of gneiss, quartzite and arkose bornhardts exist. (Full article...)
Alpine climbing (German: Alpinklettern) is a type of mountaineering that uses any of a broad range of advanced climbing techniques, including rock climbing, ice climbing, and/or mixed climbing, to summit typically large rock, ice, or snow-covered climbing routes (e.g., multi-pitch or big wall climbs) in mountainous environments. Alpine climbing began in the European Alps, but is now performed in any remote mountainous area, including in the Himalayas and Patagonia. To climb alpine style is to do so in small lightly-equipped teams who carry all their equipment (e.g., no porters are used) and do all of the climbing themselves (e.g., no sherpas or reserve teams).
Alpinists face many additional risks beyond the risks of falling that is associated with the activity of rock and ice climbing. These risks include major rockfalls (common with large sheer rock faces in alpine environments), of avalanches (especially in couloirs), of falling seracs and of falling into crevasses, of violent storms on exposed mountain faces, of altitude effects (dehydration, edema, frostbite), of complex navigation and route finding, of long dangerous abseils, and of the difficulty of rescue or retreat due to the remoteness of the setting. Long routes may require alpinists to move simultaneously to maintain speed (e.g., in simul climbing or as rope teams), which carries its own risks. (Full article...)

A ski helmet is a helmet specifically designed and constructed for winter sports. Use was rare until about 2000, but by about 2010 the majority of skiers and snowboarders in the United States and Europe wore helmets. Helmets are available in many styles and typically consist of a hard plastic or resin shell with inner padding. Modern ski helmets may include many additional features, such as vents, earmuffs, headphones, goggle mounts, and camera mounts. (Full article...)
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