View of the mountains in the countryside just outside of Punta Arenas, Chile.

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The Andes (Quechua: Anti(s)) is the world's longest mountain range, forming a continuous chain of highland along the western coast of South America. more...

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It is over 7,000 km (4,400 miles) long, 500 km (300 miles) wide in some parts (widest between 18° to 20°S latitude), and of an average height of about 4,000 m (13,000 feet). The Andean range is composed principally of two great ranges, the Cordillera Oriental and the Cordillera Occidental, often separated by a deep intermediate depression, in which arise other chains of minor importance, the chief of which is Chile's Cordillera de la Costa. Other small chains arise on the sides of the great chains. The Cordillera de la Costa starts from the southern extremity of the continent and runs in a northerly direction, parallel with the coast, being broken up at its beginning into a number of islands and afterwards forming the western boundary of the great central valley of Chile. To the north this coastal chain continues in small ridges or isolated hills along the Pacific Ocean as far as Venezuela, always leaving the same valley more or less visible to the west of the western great chain. The mountains extend over seven countries: Argentina, Bolivia, Chile, Colombia, Ecuador, Peru and Venezuela, some of which are known as Andean States. The name Andes comes from the Quechua word anti, which means "high crest."

The Andes range is the highest mountain range outside Asia, with the highest peak, Aconcagua, rising to 6,962 m (22,841 feet) above sea level. The summit of Mount Chimborazo in the Ecuadorean Andes is the point on the Earth's surface most distant from its center, because of the equatorial bulge. The Andes cannot match the Himalaya in height but do so in width and are more than twice as long.

Physical features

Geology

The formation of the Andes extends into the Paleozoic Era, when terrane accretion was the dominant process. It was during the Cretaceous Period that the Andes began to take their present form, by the uplifting, faulting and folding of sedimentary and metamorphic rocks of the ancient cratons to the east. Tectonic forces along the subduction zone along the entire west coast of South America where the Nazca Plate and a part of the Antarctic Plate are sliding beneath the South American Plate continue to produce an ongoing orogenic event resulting in minor to major earthquakes and volcanic eruptions to this day. In the extreme south a major transform fault separates Tierra del Fuego from the small Scotia Plate. Across the 1,000 km wide Drake Passage lie the mountains of the Antarctic Peninsula south of the Scotia Plate which appear to be a continuation of the Andes chain.

The Andes range has many active volcanos, the most famous being Cotopaxi, one of the highest active volcanos in the world.