Portal:Mountains

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Introduction

Silvretta panorama from the Ochsenkopf
Silvretta panorama from the Ochsenkopf
Mount Everest, Earth's highest mountain

A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least 300 metres (980 ft) above the surrounding land. A few mountains are isolated summits, but most occur in mountain ranges.

Mountains are formed through tectonic forces, erosion, or volcanism, 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). (Full article...)

Selected mountain-related landform

Pietra di Bismantova in the Apennines, Italy

An inselberg or monadnock (/məˈnædnɒk/ mə-NAD-nok) is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain. In Southern Africa a similar formation of granite is known as a koppie, an Afrikaans word ("little head") from the Dutch diminutive word kopje. If the inselberg is dome-shaped and formed from granite or gneiss, it can also be called a bornhardt, though not all bornhardts are inselbergs. An inselberg results when a body of rock resistant to erosion, such as granite, occurring within a body of softer rocks, is exposed by differential erosion and lowering of the surrounding landscape. (Full article...)

Selected mountain range

Snøhetta, the highest mountain on Dovrefjell, in the winter.

Dovrefjell is a mountain range in Central Norway that forms a natural barrier between Eastern Norway and Trøndelag. The mountain range is located in Innlandet, Møre og Romsdal, and Trøndelag counties in Norway. As a result of its central location, its valleys and passes have been heavily trafficked during and probably preceding historical times. Several mountain inns were established in the Middle Ages to house pilgrims traveling through Dovrefjell to Trondheim, and there are even ruins of an old leper colony in the northern area of it. The main south-north highway (European route E6) and the Dovrebanen railway line both run through a mountain pass in the Dovrefjell range. The highway is a year-round highway but on rare occasions it is closed for short periods during heavy winter weather conditions. The mountain range runs through the municipalities of Oppdal in Trøndelag county, Folldal, Dovre, and Lesja in Innlandet county, and Sunndal in Møre og Romsdal county. The municipalities of Oppdal, Folldal, and Dovre, together, make up what is sometimes known as the Dovre Region. (Full article...)

Selected mountain type

Mount Rainier, a 4,392 m (14,411 ft) stratovolcano, the highest point in the US state of Washington

A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and periodic intervals of explosive eruptions and effusive eruptions, although some have collapsed summit craters called calderas. The lava flowing from stratovolcanoes typically cools and solidifies before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high to intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less viscous mafic magma. Extensive felsic lava flows are uncommon, but have traveled as far as 15 km (9 mi).

Stratovolcanoes are sometimes called composite volcanoes because of their composite stratified structure, built up from sequential outpourings of erupted materials. They are among the most common types of volcanoes, in contrast to the less common shield volcanoes. Two examples of stratovolcanoes famous for catastrophic eruptions are Krakatoa in Indonesia, which erupted in 1883, and Vesuvius in Italy, having erupted in 79; both eruptions claimed thousands of lives. In modern times, Mount St. Helens in Washington State, US, and Mount Pinatubo in the Philippines have erupted catastrophically, but with fewer deaths. (Full article...)

Selected climbing article

BMC headquarters in Manchester

The British Mountaineering Council (BMC) is the national representative body for England and Wales that exists to protect the freedoms and promote the interests of climbers, hill walkers and mountaineers, including ski-mountaineers. The BMC are also recognised by government as the national governing body for competition climbing. (Full article...)

Related portals

General images

The following are images from various mountain-related articles on Wikipedia.

Selected skiing article

A resort hotel is a hotel which often contains full-sized luxury facilities with full-service accommodations and amenities. These hotels may attract both business conferences and vacationing tourists and offer more than a convenient place to stay. These hotels may be referred to as major conference center hotels, flagship hotels, destination hotels, and destination resorts. The market for conference and resort hotels is a subject for market analysis.

These hotels as destinations may be characterized by distinctive architecture, upscale lodgings, ballrooms, large conference facilities, restaurants, and recreation activities such as golf or skiing. They may be located in a variety of settings from major cities to remote locations. (Full article...)

Subcategories

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Topics

NASA Landsat-7 imagery of Himalayas
NASA Landsat-7 imagery of Himalayas
Shivling
Shivling
Eruption of Pinatubo 1991

Flora and fauna

Climbing in Greece
Climbing in Greece

Lists of mountains

Recognized content

Associated Wikimedia

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