Alps

The Alps (Italian: Alpi; French: Alpes; Occitan: Arpes; German: Alpen; Romansh: Alps; Slovene: Alpe) is the name for one of the great mountain range systems of Europe, stretching from Austria and Slovenia in the east; through Italy, Switzerland, Liechtenstein and Germany; to France in the west.
The highest mountain in the Alps is Mont Blanc, at 4,808 metres (15,774 ft), on the Italian–French border. All the main peaks of the Alps can be found in the list of mountains of the Alps and list of Alpine peaks by prominence.
The English name "Alps" was taken via French from Latin Alpes, which may be ultimately cognate with Latin albus ("white"). The German Albe, Alpe or Alp (f., Old High German alpâ, plural alpûn) in the singular means "alpine pasture", and only in the plural may also refer to the mountain range as a whole.[1]

Geology and orogeny

The Alps form a part of a Tertiary orogenic belt of mountain chains, called the Alpide belt, that stretches through southern Europe and Asia from the Atlantic all the way to the Himalayas. This belt of mountain chains was formed during the Alpine orogeny. A gap in these mountain chains in central Europe separates the Alps from the Carpathians off to the east. Orogeny took place continuously and tectonic subsidence is to blame for the gaps in between.
The Alps arose as a result of the collision of the African and European tectonic plates, in which the western part of the Tethys Ocean, which was formerly in between these continents, disappeared. Enormous stress was exerted on sediments of the Tethys Ocean basin and its Mesozoic and early Cenozoic strata were pushed against the stable Eurasian landmass by the northward-moving African landmass. Most of this occurred during the Oligocene and Miocene epochs. The pressure formed great recumbent folds, or nappes, that rose out of what had become the Tethys Sea and pushed northward, often breaking and sliding one over the other to form gigantic thrust faults. Crystalline basement rocks, which are exposed in the higher central regions, are the rocks forming Mont Blanc, the Matterhorn, and high peaks in the Pennine Alps and Hohe Tauern.
The formation of the Mediterranean Sea is a more recent development, and does not mark the northern shore of the African landmassClimateThe Alps are a classic example of what happens when a temperate area at lower altitude gives way to higher-elevation terrain. Elevations around the world which have cold climates similar to those found in polar areas have been called Alpine. A rise from sea level into the upper regions of the atmosphere causes the temperature to decrease (see adiabatic lapse rate). The effect of mountain chains on prevailing winds is to carry warm air belonging to the lower region into an upper zone, where it expands in volume at the cost of a proportionate loss of heat, often accompanied by the precipitation in the form of snow or rain.
Political and cultural history

little is known of the early dwellers of the Alps, save from scanty accounts preserved by Roman and Greek historians and geographers. A few details have come down to us of the conquest of many of the Alpine tribes by Augustus. Also, recent research into Mitochondrial DNA indicates that MtDNA Haplogroup K very likely originated in or near the southeastern Alps approximately 12–15,000 years ago.
During the Second Punic War in 218 BC, the Carthaginian general Hannibal successfully crossed the Alps along with an army numbering 38,000 infantry, 8,000 cavalry, and 37 war elephants.[3] This was one of the most celebrated achievements of any military force in ancient warfare.[3]
Much of the Alpine region was gradually settled by Germanic tribes (Langobards, Alemanni, Bavarii) from the 6th to the 13th centuries, the latest expansion corresponding to the Walser migrations.
Not until after the final breakup of the Carolingian Empire in the 10th and 11th century can the local history of the Alps be traced out

Exploration

The higher regions of the Alps were long left to the exclusive attention of the people of the adjoining valleys, even when Alpine travellers (as distinguished from Alpine climbers) began to visit these valleys. The two men who first explored the regions of ice and snow were H.B. de Saussure (1740–1799) in the Pennine Alps, and the Benedictine monk of Disentis Placidus a Spescha (1752–1833), most of whose ascents were made before 1806, in the valleys at the sources of the Rhine.
Travel and tourism

The Alps are popular both in summer and in winter as a destination for sightseeing and sports. Winter sports (Alpine and Nordic skiing, snowboarding, tobogganing, snowshoeing, ski tours) can be practised in most regions from December to April. In summer, the Alps are popular with hikers, mountain bikers, paragliders, mountaineers, while many alpine lakes attract swimmers, sailors and surfers. The lower regions and larger towns of the Alps are well served by motorways and main roads, but higher passes and by-roads can be treacherous even in summer. Many passes are closed in winter. A multitude of airports around the Alps (and some within), as well as long-distance rail links from all neighbouring countries, afford large numbers of travellers easy access from abroad. The Alps typically see more than 100 million visitors a year.