The Dent Blanche is a mountain in the Pennine Alps, lying in the canton of Valais in Switzerland. With its 4,357 metres -high summit, it is one of the highest peaks in the Alps, the original name was probably Dent dHérens, the actual name of the nearby Dent dHérens which does not overlook the Val dHérens. The nearby north face of the Dent dHérens is glaciated while the Dent Blanche holds much less snow, in fact on older maps, in the area where lie both summits, only the name Weisszahnhorn was indicated, the French name appearing in 1820 only. The actual names are official since the completion of the Dufour map in 1862, the summit of Dent Blanche is an important geographic place as it is the converging point of three ridges. The three valleys separated by them are the Val dHérens, Val dAnniviers and Mattertal, the respective villages of Evolène, Zinal and Zermatt lie approximatively at the same distance of the mountain. The four ridges encompass almost exactly the four cardinal directions, the west ridge is named Arête de Ferpècle and the east ridge is named Arête des Quatre Ânes.
The Col de la Dent Blanche lies at the foot of the northern ridge, the Dent Blanche Hut lies at the foot of the southern ridge which is used as the normal route. The region around Dent Blanche consists of many 4000 metres peaks, the Ober Gabelhorn, Dent dHérens and Matterhorn are the closest high summits. The first ascent was made via the ridge, which is the less difficult route to the summit. On 12 July 1862, T. S. Kennedy, after an attempt on the east face of the unconquered Matterhorn, almost reached the summit with the guides Peter Taugwalder, but after a minor accident, Peter Taugwalder refused to go any higher. Kennedy would finally reach the only a few days later, on July 18,1862 with W. Wigram, J. Croz and J. Konig. A route on the west ridge was opened on 11 August 1882 by John Stafford Anderson and G. P. Baker, with guides Alois Pollinger of St. Niklaus in the canton Valais and Ulrich Almer. They started from the Mountet Hut and arrived at the summit after a difficult 12 hours climbing on a ridge overlooking the north face.
As Almer said on the summit, We are four asses, the north ridge was explored in 1899. On 28 August O. G. Jones, F. W. Hill with guides E. Furrer, zurbriggen and J. Vuignier headed to the summit but they fell and only Hill survived. He reached alone the summit and a storm forced him to make a bivouac and he could report the news of the fatal accident in Zermatt only two days later. The first ascent of the face is attributed to K. Schneider. They climbed from the part at the base of the face to the summit
A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. Mathematically, a summit is a maximum in elevation. The topographic terms acme, apex and zenith are synonymous, the UIAA definition is that a summit is independent if it has a prominence of 30 metres or more, it is a mountain if it has a prominence of at least 300 metres. This can be summarised as follows, A pyramidal peak is an exaggerated form produced by ice erosion of a mountain top, Summit may refer to the highest point along a line, trail, or route. In many parts of the western United States, the term refers to the highest point along a road, highway. For example, the highest point along Interstate 80 in California is referred to as Donner Summit while the highest point on Interstate 5 is Siskiyou Mountain Summit, geoid Hill List of highest mountains Maxima and minima Nadir Summit accordance Peak finder
A mountain range is a geographic area containing numerous geologically related mountains. A mountain system or system of ranges, sometimes is used to combine several geological features that are geographically related. Mountain ranges are usually segmented by highlands or mountain passes and valleys, individual mountains within the same mountain range do not necessarily have the same geologic structure or petrology. They may be a mix of different orogenic expressions and terranes, for example thrust sheets, uplifted blocks, fold mountains, most geologically young mountain ranges on the Earths land surface are associated with either the Pacific Ring of Fire or the Alpide Belt. The Andes is 7,000 kilometres long and is considered the worlds longest mountain system. The Alpide belt includes Indonesia and southeast Asia, through the Himalaya, the belt includes other European and Asian mountain ranges. The Himalayas contain the highest mountains in the world, including Mount Everest, mountain ranges outside of these two systems include the Arctic Cordillera, the Urals, the Appalachians, the Scandinavian Mountains, the Altai Mountains and the Hijaz Mountains.
If the definition of a range is stretched to include underwater mountains. The mountain systems of the earth are characterized by a tree structure, the sub-range relationship is often expressed as a parent-child relationship. For example, the White Mountains of New Hampshire and the Blue Ridge Mountains are sub-ranges of the Appalachian Mountains, the Appalachians are the parent of the White Mountains and Blue Ridge Mountains, and the White Mountains and the Blue Ridge Mountains are children of the Appalachians. The position of mountains influences climate, such as rain or snow, when air masses move up and over mountains, the air cools producing orographic precipitation. As the air descends on the side, it warms again and is drier. Often, a shadow will affect the leeward side of a range. Mountain ranges are constantly subjected to forces which work to tear them down. Erosion is at work while the mountains are being uplifted and long after until the mountains are reduced to low hills, rivers are traditionally believed to be the principle erosive factor on mountain ranges, with their ability of bedrock incision and sediment transport.
The rugged topography of a range is the product of erosion. The basins adjacent to a mountain range are filled with sediments which are buried and turned into sedimentary rock. The early Cenozoic uplift of the Rocky Mountains of Colorado provides an example and this mass of rock was removed as the range was actively undergoing uplift
The Pennine Alps, known as the Valais Alps, and formerly called Alpes Poeninae, are a mountain range in the western part of the Alps. They are located in Switzerland and Italy, the Italian side is drained by the rivers Dora Baltea and Toce, tributaries of the Po. The Swiss side is drained by the Rhône, the Great St Bernard Tunnel, under the Great St Bernard Pass, leads from Martigny, Switzerland to Aosta. The main chain runs from west to east on the border between Italy and Switzerland, from Mont Vélan, the first high summit east of St Bernard Pass, the chain rarely goes below 3000 metres and contains many four-thousanders such as Matterhorn or Monte Rosa. Unlike many other ranges, the higher peaks are often located outside the main chain
Zermatt is a municipality in the district of Visp in the German-speaking section of the canton of Valais in Switzerland. It has a population of about 5,800 inhabitants, the town lies at the upper end of Mattertal at an elevation of 1,620 m, at the foot of Switzerlands highest peaks. It lies about 10 km from the over 10,800 ft high Theodul Pass bordering Italy, Zermatt is famed as a mountaineering and ski resort of the Swiss Alps. The year round population is 5,759, though there may be several times as many tourists in Zermatt at any one time. Much of the economy is based on tourism, with about half of the jobs in town in hotels or restaurants. Just over one-third of the permanent population was born in the town, the name of Zermatt, as well as that of the Matterhorn itself, derives from the alpine meadows, or matten, in the valley. The name appeared first as Zur Matte and became Zermatt and it does not appear until 1495 on a map or 1546 in a text, but may have been employed long before. Praborno or Prato Borno are the names of Zermatt, they appear in the ancient maps as early as the thirteenth century.
The Romand-speaking people from the Aosta Valley and from the Romand-speaking part of canton Wallis used this name until about 1860 in the form of Praborne, the reason of this change from Praborno to Zermatt is attributed to the gradual replacement of the Romance-speaking people by German-speaking colony. The town of Zermatt lies at the end of the Matter Valley. Zermatt is almost completely surrounded by the mountains of the Pennine Alps among which Monte Rosa. It is followed by the Dom, Lyskamm and the Matterhorn, most of the Alpine four-thousanders are located around Zermatt or in the neighbouring valleys. The town of Zermatt, while dense, is geographically small, there are three main streets which run along the banks of the river Matter Vispa, and numerous cross-streets, especially around the station and the church which forms the centre of Zermatt. In general anything is at most a thirty-minute walk away, there are several suburbs within Zermatt. Winkelmatten, which was once a hamlet, lies on a hill on the southern side.
Steinmatten is located on the bank of the main river. Many hamlets are located in the valleys above Zermatt, however they are not usually inhabited all year round, zum See lies south of Zermatt on the west bank of the Gorner gorge, near Furi where a cable car station is located. On the side of Zmutt valley lies the hamlet of Zmutt, findeln is located in the eastern valley above the Findelbach river
It is a measure of the independence of a summit. A peaks key col is a point on this contour line. By convention, the prominence of Mount Everest, the Earths highest mountain, is taken to equal the elevation of its summit above sea level, if the peaks prominence is P metres, to get from the summit to any higher terrain one must descend at least P metres. Together with the convention for Mount Everest, this implies that the prominence of any island or continental highpoint is equal to its elevation above sea level, for every ridge connecting the peak to higher terrain, find the lowest point on the ridge. The key col is defined as the highest of these cols, the prominence is the difference between the elevation of the peak and the elevation of the key col. The following mental exercise may illustrate the meaning of topographic prominence, imagine you are standing at the top of a peak and imagine that an imaginary sea level rises to your feet. Now slowly lower the sea level and an imaginary island appears beneath your feet.
Your island will grow and will merge with other islands that emerge, the parent peak may be either close or far from the subject peak. The summit of Mount Everest is the parent peak of Aconcagua at a distance of 17,755 km, the key col may be close or far from the subject peak. The key col for Aconcagua is the Bering Strait at a distance of 13,655 km, the key col for the South Summit of Mount Everest is about 100 m distant. Prominence is interesting to many mountaineers because it is a measurement that is strongly correlated with the subjective significance of a summit. Peaks with low prominences are either subsidiary tops of some higher summit or relatively insignificant independent summits, peaks with high prominences tend to be the highest points around and are likely to have extraordinary views. Only summits with a sufficient degree of prominence are regarded as independent mountains, for example, the worlds second-highest mountain is K2. While Mount Everests South Summit is taller than K2, it is not considered an independent mountain because it is a subsummit of the main summit, many lists of mountains take topographic prominence as a criterion for inclusion, or cutoff.
John and Anne Nuttalls The Mountains of England and Wales uses a cutoff of 15 m, in the contiguous United States, the famous list of fourteeners uses a cutoff of 300 ft /91 m. Also in the U. S.2000 feet of prominence has become a threshold that signifies that a peak has major stature. This generates lists of peaks ranked by prominence, which are different from lists ranked by elevation. Such lists tend to emphasize isolated high peaks, such as range or island high points, one advantage of a prominence-ranked list is that it needs no cutoff, since a peak with high prominence is automatically an independent peak
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 steeper than a hill. Mountains are formed through tectonic forces or volcanism and these forces can locally raise the surface of the earth. Mountains erode slowly through the action of rivers, weather conditions, a few mountains are isolated summits, but most occur in huge mountain ranges. High elevations on mountains produce colder climates than at sea level and 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, the highest mountain on Earth is Mount Everest in the Himalayas of Asia, whose summit is 8,850 m above mean sea level. The highest known mountain on any planet in the Solar System is Olympus Mons on Mars at 21,171 m, there is no universally accepted definition of a mountain.
Elevation, relief, steepness and continuity have been used as criteria for defining a mountain, 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 300 m, Mount Scott outside Lawton, Oklahoma is only 251 m from its base to its highest point. Whittows Dictionary of Physical Geography states Some authorities regard eminences above 600 metres as mountains, in addition, some definitions include a topographical prominence requirement, typically 100 or 500 feet. For a while, the US defined a mountain as being 1,000 feet or taller, any similar landform lower than this height was considered a hill. However, the United States Geological Survey concludes that these terms do not have technical definitions in the US, using these definitions, mountains cover 33% of Eurasia, 19% of South America, 24% of North America, and 14% of Africa. As a whole, 24% of the Earths land mass is mountainous, there are three main types of mountains, volcanic and block.
All three types are formed from plate tectonics, when portions of the Earths crust move, 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, 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, at a depth of around 100 km, melting occurs in rock above the slab, and forms magma that reaches the surface. When the magma reaches the surface, it builds a volcanic mountain. 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 US