Open Access Articles- Top Results for Mountain
Journal of Clinical & Experimental CardiologyLow-altitude Mountain Tourism Increases Overall Heart Rate Variability and Decreases Heart Rate and Blood Pressures in Healthy Adults
Forest Research: Open AccessEvaluating Pinus nigra Arn. Ssp Salzmannii (Dunal Franco) Initial Seedling Growth in Different Mediterranean Mountain Areas
Forest Research: Open AccessForest Management and Climate Changing Conditions: Some Insight from Pinus nigra Arn. Ssp. Salzmannii Cuenca Mountains Forest
Bioenergetics: Open AccessEffects of an Ultra-Endurance Event on Body Composition, Exercise Performance and Markers of Clinical Health: A Case Study
A mountain is a large landform that stretches above the surrounding land in a limited area, usually in the form of a peak. A mountain is generally steeper than a hill. Mountains are formed through tectonic forces or volcanism. These forces can locally raise the surface of the earth. Mountains erode slowly through the action of rivers, weather conditions, and glaciers. A few mountains are isolated summits, but most occur in huge mountain ranges.
High elevations on mountains produce colder climates than at sea level. 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 and recreation, such as mountain climbing.
The highest mountain on Earth is Mount Everest in the Himalayas of Asia, whose summit is Script error: No such module "convert". above mean sea level. The highest known mountain on any planet in the Solar System is Olympus Mons on Mars at Script error: No such module "convert"..
There is no universally accepted definition of a mountain. Elevation, volume, relief, steepness, spacing and continuity have been used as criteria for defining a mountain. In the Oxford English Dictionary a mountain is defined as "a natural elevation of the earth surface rising more or less abruptly from the surrounding level and attaining an altitude which, relatively to the adjacent elevation, is impressive or notable."
Whether a landform is called a mountain may depend on local usage. The highest point in San Francisco, California, is called Mount Davidson, notwithstanding its height of Script error: No such module "convert"., which makes it twenty feet short of the minimum for a mountain by American designations. Similarly, Mount Scott outside Lawton, Oklahoma is only Script error: No such module "convert". from its base to its highest point. Whittow's Dictionary of Physical Geography states "Some authorities regard eminences above 600 m (2,000 ft) as mountains, those below being referred to as hills."
In the United Kingdom and the Irish Republic, a mountain is usually defined as any summit at least 2,000 feet (or 610 metres) high, whilst the official United Kingdom government's definition of a mountain, for the purposes of access, is a summit of 600 metres or higher. In addition, some definitions also include a topographical prominence requirement, typically Script error: No such module "convert".. For a while, the US defined a mountain as being Script error: No such module "convert". or taller. Any similar landform lower than this height was considered a hill. However, today, the United States Geological Survey (USGS) concludes that these terms do not have technical definitions in the US.
The UN Environmental Programme's definition of "mountainous environment" includes any of the following:
- Elevation of at least Script error: No such module "convert".;
- Elevation of at least Script error: No such module "convert"., with a slope greater than 2 degrees;
- Elevation of at least Script error: No such module "convert"., with a slope greater than 5 degrees;
- Elevation of at least Script error: No such module "convert"., with a Script error: No such module "convert". elevation range within Script error: No such module "convert"..
There are three main types of mountains: volcanic, fold, and block. All three types are formed from plate tectonics: when portions of the Earth's crust move, crumple, and dive. Compressional forces, isostatic uplift and intrusion of igneous matter forces surface rock upward, creating a landform higher than the surrounding features. The height of the feature makes it either a hill or, if higher and steeper, a mountain. Major mountains tend to occur in long linear arcs, indicating tectonic plate boundaries and activity.
Volcanoes are formed when a plate is pushed below another plate, or at a mid-ocean ridge or hotspot. At a depth of around 100 km, melting occurs in rock above the slab (due to the addition of water), and forms magma that reaches the surface. When the magma reaches the surface, it often builds a volcanic mountain, such as a shield volcano or a stratovolcano. Examples of volcanoes include Mount Fuji in Japan and Mount Pinatubo in the Philippines. The magma does not have to reach the surface in order to create a mountain: magma that solidifies below ground can still form dome mountains, such as Navajo Mountain in the United States.
Fold mountains occur when two plates collide: shortening occurs along thrust faults and the crust is overthickened. Since the less dense continental crust "floats" on the denser mantle rocks beneath, the weight of any crustal material forced upward to form hills, plateaus or mountains must be balanced by the buoyancy force of a much greater volume forced downward into the mantle. Thus the continental crust is normally much thicker under mountains, compared to lower lying areas. Rock can fold either symmetrically or asymmetrically. The upfolds are anticlines and the downfolds are synclines: in asymmetric folding there may also be recumbent and overturned folds. The Jura Mountains are an example of fold mountains.
Block mountains are caused by faults in the crust: a seam where rocks can move past each other. When rocks on one side of a fault rise relative to the other, it can form a mountain. The uplifted blocks are block mountains or horsts. The intervening dropped blocks are termed graben: these can be small or form extensive rift valley systems. This form of landscape can be seen in East Africa, the Vosges, the Basin and Range province of Western North America and the Rhine valley. These areas often occur when the regional stress is extensional and the crust is thinned.
During and following uplift, mountains are subjected to the agents of erosion (water, wind, ice, and gravity) which gradually wear the uplifted area down. Erosion causes the surface of mountains to be younger than the rocks that form the mountains themselves. Glacial processes produce characteristic landforms, such as pyramidal peaks, knife-edge arêtes, and bowl-shaped cirques that can contain lakes. Plateau mountains, such as the Catskills, are formed from the erosion of an uplifted plateau.
Climate on mountains become colder at high elevations, due to the way that the sun heats the surface of the Earth. The sun warms the ground directly, while the greenhouse effect acts as a blanket, reflecting heat back towards the Earth that would otherwise be lost to space. The greenhouse effect thus keeps the air at low elevations warm. As elevation increases, there is less greenhouse effect, so the ambient temperature goes down.
The rate at which the temperature drops with elevation, called the environmental lapse rate, is not constant (it can fluctuate throughout the day or seasonally and also regionally), but a typical lapse rate is 5.5°C per 1,000 m (3.57°F per 1,000 ft). Therefore, moving up 100 meters on a mountain is roughly equivalent to moving 80 kilometers (45 miles or 0.75° of latitude) towards the nearest pole. This relationship is only approximate, however, since local factors such as proximity to oceans (such as the Arctic Ocean) can drastically modify the climate. As the altitude increases, the main form of precipitation becomes snow and the winds increase.
The effect of the climate on the ecology at an elevation can be largely captured through a combination of amount of precipitation, and the biotemperature, as described by Leslie Holdridge in 1947. Biotemperature is the mean temperature; all temperatures below Script error: No such module "convert". are considered to be 0 °C. When the temperature is below 0 °C, plants are dormant, so the exact temperature is unimportant. The peaks of mountains with permanent snow can have a biotemperature below Script error: No such module "convert"..
The colder climate on mountains affects the plants and animals residing on mountains. A particular set of plants and animals tend to be adapted to a relatively narrow range of climate. Thus, ecosystems tend to lie along elevation bands of roughly constant climate. This is called altitudinal zonation. In regions with dry climates, the tendency of mountains to have higher precipitation as well as lower temperatures also provides for varying conditions, which enhances zonation.
Some plants and animals found in altitudinal zones tend to become isolated since the conditions above and below a particular zone will be inhospitable and thus constrain their movements or dispersal. These isolated ecological systems are known as sky islands.
Altitudinal zones tend to follow a typical pattern. At the highest elevations, trees cannot grow, and whatever life may be present will be of the alpine type, resembling tundra. Just below the tree line, one may find subalpine forests of needleleaf trees, which can withstand cold, dry conditions. Below that, montane forests grow. In the temperate portions of the earth, those forests tend to be needleleaf trees, while in the tropics, they can be broadleaf trees growing in a rain forest.
Mountains are generally less preferable for human habitation than lowlands, because of harsh weather and little level ground suitable for agriculture. While 7% of the land area of Earth is above Script error: No such module "convert"., only 140 million people live above that altitude and only 20-30 million people above Script error: No such module "convert". elevation. The decreasing atmospheric pressure with increasing elevation means that less oxygen is available for breathing, and there is less protection against solar radiation (UV). Due to decreasing oxygen, the highest known permanent habitation in the world is at Script error: No such module "convert"., while the highest known permanently tolerable altitude is at Script error: No such module "convert".. Above Script error: No such module "convert". elevation, there is not enough oxygen to support human life. This is known as the "death zone". The summits of Mount Everest and K2 are in the death zone.
About half of mountain dwellers live in the Andes, Central Asia, and Africa. Traditional mountain societies rely on agriculture, with higher risk of crop failure than at lower elevations. Minerals often occur in mountains, with mining being an important component of the economics of some montane societies. More recently, tourism supports mountain communities, with some intensive development around attractions such as national parks or ski resorts. About 80% of mountain people live below the poverty line.
Mountaineering, mountain climbing, or alpinism is the sport, hobby or profession of hiking, skiing, and climbing mountains. While mountaineering began as attempts to reach the highest point of unclimbed big mountains it has branched into specializations that address different aspects of the mountain and consists of three areas: rock-craft, snow-craft and skiing, depending on whether the route chosen is over rock, snow or ice. All require experience, athletic ability, and technical knowledge to maintain safety.
Heights of mountains are typically measured above sea level. Using this metric, Mount Everest is the highest mountain on Earth, at Script error: No such module "convert".. There are at least 100 mountains with heights of over Script error: No such module "convert". above sea level, all of which are located in central and southern Asia. The highest mountains above sea level are generally not the highest above the surrounding terrain. There is no precise definition of surrounding base, but Mount McKinley, Mount Kilimanjaro and Nanga Parbat are possible candidates for the tallest mountain on land by this measure. The bases of mountain islands are below sea level, and given this consideration Mauna Kea (Script error: No such module "convert". above sea level) is the world's tallest mountain and volcano, rising about Script error: No such module "convert". from the Pacific Ocean floor.
The highest mountains are not generally the most voluminous. Mauna Loa (Script error: No such module "convert".) is the largest mountain on Earth in terms of base area (about Script error: No such module "convert".) and volume (about Script error: No such module "convert".). Mount Kilimanjaro is the largest non-shield volcano in terms of both base area (Script error: No such module "convert".) and volume (Script error: No such module "convert".). Mount Logan is the largest non-volcanic mountain in base area (Script error: No such module "convert".).
The highest mountains above sea level are also not those with peaks farthest from the centre of the Earth, because the figure of the Earth is not spherical. Sea level closer to the equator is several miles farther from the centre of the Earth. The summit of Chimborazo, Ecuador's tallest mountain, is usually considered to be the farthest point from the Earth's centre, although the southern summit of Peru's tallest mountain, Huascarán, is another contender. Both have elevations above sea level more than Script error: No such module "convert". less than that of Everest.
- Latin names of mountains
- List of mountain ranges
- List of peaks by prominence
- List of ski areas and resorts
- Lists of mountains
- Mountain hut
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the base to peak rise of Mount McKinley is the largest of any mountain that lies entirely above sea level, some 18,000 feet.
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