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Andes

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The Andes are the longest continental mountain range on Earth.

Panoramic view Andes-Chile
Panoramic view Andes-Chile

This massive system forms a continuous highland along the western edge of South America. It stretches approximately 8,900 km in length. The range is between 200 km and 700 km wide. It passes through seven different countries. These are Argentina, Chile, Bolivia, Peru, Ecuador, Colombia, and Venezuela.

The Blue Marble, AS17-148-22727
The Blue Marble, AS17-148-22727

The mountains are part of the American Cordillera. This is a large chain of mountain ranges. It forms the western backbone of the Americas and Antarctica.

The formation of the Andes is a result of tectonic plate processes. This process is known as orogeny, which is the process of mountain building. The mountains sit along the Pacific Ring of Fire. This is a zone of intense volcanic activity. The primary cause is the subduction of oceanic crust. Specifically, the Nazca Plate and the Antarctic Plate are sliding beneath the South American Plate. This convergence causes the western rim of the South American Plate to contract. This contraction pushes the land upward to create the high peaks.

WikiProject Geology
WikiProject Geology

Climate plays a significant role in how these mountains grow. As the Andes rose, they created a rain shadow on the western edges of Chile. This happened because the mountains blocked moisture. Ocean currents and prevailing winds carried moisture away from the coast. This left some areas of the subduction zone without much sediment. Without sediment, the subducting plate lacked a lubricated surface. This lack of lubrication actually increased the rate of coastal uplift. This shows how weather and geology can work together to shape the land.

The Andes can be divided into several distinct sections. Geographically, they are split into the Northern, Central, and Southern Andes. The Northern Andes include Colombia, Ecuador, and Venezuela. The Central Andes cover Bolivia and Peru. The Southern Andes are located in Argentina and Chile.

Cusco, Peru skyline
Cusco, Peru skyline

Within these sections, the mountains are further divided by climate. Scientists group them into the Tropical Andes, the Dry Andes, and the Wet Andes. This creates many different ecological zones. These zones range from humid cloud forests to arid high plains.

The history of this mountain building began millions of years ago. The process started during the Triassic period when Pangaea began to break up. The development continued through the Jurassic Period. The Andes began to take their present form during the Cretaceous Period. This happened through the uplifting and folding of rocks. The rise of the mountains has not been constant. Different regions experienced different levels of tectonic stress and erosion.

Church Heart of the Andes
Church Heart of the Andes

This long history created the rugged relief we see today.

The Andes hold many incredible geological records. Aconcagua in Argentina is the highest peak at 6,961 meters.

Aconcagua 13
Aconcagua 13

Another peak, Chimborazo in Ecuador, is very unique. Because of the equatorial bulge, Chimborazo is the point farthest from the Earth's center.

David Torres Costales Chimborazo Riobamba Ecuador Montaña Mas Alta del Mundo
David Torres Costales Chimborazo Riobamba Ecuador Montaña Mas Alta del Mundo

The range also contains the world's highest volcanoes. Ojos del Salado sits on the Chile–Argentina border at 6,893 meters.

Sopka Cerro Parinacota 6342 m.n.m. - panoramio
Sopka Cerro Parinacota 6342 m.n.m. - panoramio

These peaks demonstrate the extreme elevations of the range.

Human life in the Andes is deeply connected to the high terrain. Many major cities are built on high plateaus.

La Paz Skyline
La Paz Skyline

The Altiplano is one such plateau. It is the second highest in the world after the Tibetan Plateau. Cities like La Paz, El Alto, and Bogotá thrive in these high environments. The mountains also provide valuable resources. The western slopes contain large deposits of copper. Chile and Peru are the world's top exporters of this metal. The mountains also host large salt and hydrocarbon deposits. This makes the Andes a vital region for both people and global industry.

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🖼️ Images & Media (40)
File:WikiProject Geology.svg
WikiProject Geology.svg
File:Symbol template class pink.svg
Symbol template class pink.svg
File:The Blue Marble, AS17-148-22727.jpg
The Blue Marble, AS17-148-22727.jpg
File:Church Heart of the Andes.jpg
Church Heart of the Andes.jpg
File:ARG-2016-Aerial-Tierra del Fuego (Ushuaia)–Valle Carbajal 01.jpg
ARG-2016-Aerial-Tierra del Fuego...
File:Guanaco Patagonico.jpg
Guanaco Patagonico.jpg
File:Sol de Mañana coloración roja.jpg
Sol de Mañana coloración roja.jpg
File:Cerro Fitz Roy, Argentinien (10423452643).jpg
Cerro Fitz Roy, Argentinien (10423452643).jpg
File:Spraying pesticides in quinoa field.JPG
Spraying pesticides in quinoa field.JPG
File:La Paz Skyline.jpg
La Paz Skyline.jpg
File:Cusco, Peru skyline.jpg
Cusco, Peru skyline.jpg
File:David Torres Costales Chimborazo Riobamba Ecuador Montaña Mas Alta del Mundo.jpg
David Torres Costales Chimborazo Riobamba...

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