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The Alps are one of the great mountain range systems of Europe stretching approximately 1,200 kilometres (750 mi) across eight Alpine countries from Austria and Slovenia in the east, Switzerland, Liechtenstein, Germany, France to the west and Italy and Monaco to the south. The mountains were formed over hundreds of millions of years as the African and Eurasian tectonic plates collided. Extreme shortening caused by the event resulted in marine sedimentary rocks rising by thrusting and folding into high mountain peaks such as Mont Blanc and the Matterhorn. Mont Blanc spans the French--Italian border, and at 4,810.45 m (15,782 ft) is the highest mountain in the Alps. The Alpine region area contains many peaks higher than 4,000 m (13,123 ft), known as the "four-thousanders".The altitude and size of the range affects the climate in Europe; in the mountains precipitation levels vary greatly and climatic conditions consist of distinct zones. Wildlife such as ibex live in the higher peaks to elevations of 3,400 m (11,155 ft), and plants such as Edelweiss grow in rocky areas in lower elevations as well as in higher elevations. Evidence of human habitation in the Alps goes back to the Paleolithic era. A mummified man, determined to be 5,000 years old, was discovered on a glacier at the Austrian--Italian border in 1991. By the 6th century BC, the Celtic La Tène culture was well established. Hannibal may have crossed the Alps with a herd of elephants, and the Romans had settlements in the region. In 1800 Napoleon crossed one of the mountain passes with an army of 40,000. The 18th and 19th centuries saw an influx of naturalists, writers, and artists, in particular the Romantics, followed by the golden age of alpinism as mountaineers began to ascend the peaks. In World War II the Third Reich invaded the Alpine countries, with the exception of Switzerland and Liechtenstein; Adolf Hitler kept a base of operation in the Bavarian Alps throughout the war.The Alpine region has a strong cultural identity. The traditional culture of farming, cheesemaking, and woodworking still exists in Alpine villages, although the tourist industry began to grow early in the 20th century and expanded greatly after World War II to become the dominant industry by the end of the century. The Winter Olympic Games have been hosted in the Swiss, French, Italian, Austrian and German Alps. At present the region is home to 14 million people and has 120 million annual visitors.The English word Alps derives from the French and Latin Alpes, which at one time was thought to be derived from the Latin albus ("white"). The term alp, alm, albe or alpe refers to a grazing pastures in the alpine regions below the glaciers, not the peaks. An alp refers to a high mountain pasture where cows are taken to be grazed during the summer months and where hay barns can be found, and the term "the Alps", referring to the mountains, is a misnomer. The term for the mountain peaks varies by nation and language: words such as horn, kogel, gipfel, and berg are used in German speaking regions: mont and aiguille in French speaking regions; and monte or cima in Italian speaking regions.The original meaning may be from "white" in reference to the permanent snow. The term may be common to Italo-Celtic, because the Celtic languages have terms for high mountains derived from alp. German Alpen is the accusative in origin, but was made the nominative in Modern German, whence also Alm.Another theory is that in Latin Alpes is a name of non-Indo-European origin (which is common for prominent mountains and mountain ranges in the Mediterranean region). According to the Old English Dictionary, the Latin Alpes might possibly derive from a pre-Indo-European word *alb "hill", with Albania being a related derivation. Interestingly, Albania (which is a foreign name for modern Albanians) has been used as a name for a number of mountainous areas across Europe. In Roman times, Albania was a name for the eastern Caucasus, while in the English language Albania (or Albany) was occasionally used as a name for Scotland. Important geological concepts were established as naturalists began studying the rock formations of the Alps in the 18th century. In the mid-19th century the now defunct theory of geosynclines was used to explain the presence of "folded" mountain chains but by the mid-20th century the theory of plate tectonics became widely accepted. The geologic folding seen at the Arpanaz waterfall, shown here in a mid-18th century drawing, was noted by 18th-century geologists. The formation of the Alps (the Alpine orogeny) was an episodic process that began about 300 million years ago. In the Paleozoic Era the Pangaean supercontinent consisted of a single tectonic plate; it broke into separate plates during the Mesozoic Era and the Tethys sea developed between Laurasia and Gondwana during the Jurassic Period.