Portal:Mountains
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Portal:Mountains

Introduction

Appalachian Mountains

A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. A mountain differs from a plateau in having a limited summit area, and is larger than a hill, typically rising at least 300 metres (1000 feet) 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

Skeiðarársandur in Iceland, viewed from its eastern margin at the terminus of Svínafellsjökull glacier

An outwash plain, also called a sandur (plural: sandurs), sandr or sandar, is a plain formed of glaciofluvial deposits due to meltwater outwash at the terminus of a glacier. As it flows, the glacier grinds the underlying rock surface and carries the debris along. The meltwater at the snout of the glacier deposits its load of sediment over the outwash plain, with larger boulders being deposited near the terminal moraine, and smaller particles travelling further before being deposited. Sandurs are common in Iceland where geothermal activity accelerates the melting of ice flows and the deposition of sediment by meltwater. (Full article...)

Selected mountain range

SanGabrielMountains.jpg

The Puente Hills are a chain of hills, one of the lower Transverse Ranges, in an unincorporated area in eastern Los Angeles County, California, in the United States. The western end of the range is often referred to locally as the Whittier Hills. (Full article...)

Selected mountain type

Fjäll landscape in Padjelanta, Swedish Lapland

A fell (from Old Norse fell, fjall, "mountain") is a high and barren landscape feature, such as a mountain or moor-covered hill. The term is most often employed in Norway, Fennoscandia, the Isle of Man, parts of northern England, and Scotland. (Full article...)

Selected climbing article

A man climbing a palmyra palm

Tree climbing is a recreational or functional activity consisting of ascending and moving around in the crown of trees.

A rope, helmet, and harness can be used to increase the safety of the climber. Other equipment can also be used depending on the experience and skill of the tree climber. Some tree climbers take special hammocks called "Treeboats" and Portaledges with them into the tree canopies where they can enjoy a picnic or nap, or spend the night. (Full article...)

Selected images

Selected skiing article

This is a list of skiing deaths of notable people, in chronological order, and includes skiers and snowboarders both professional and recreational whose deaths are due to accidents or avalanches. (Full article...)

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