KARAKORAM

karakoram:

Karakoram (or Karakorum) is a large mountain range spanning the borders between Pakistan, India and China, located in the regions of Gilgit-Baltistan (Pakistan), Ladakh (India), and Xinjiang region, (China). It is one of the Greater Ranges of Asia, a part of the greater Himalaya while north of the actual Himalaya Range.

Karakoram (or Karakorum) is a large mountain range spanning the borders between Pakistan, India and China, located in the regions of Gilgit-Baltistan (Pakistan), Ladakh (India), and Xinjiang region, (China). It is one of the Greater Ranges of Asia, a part of the greater Himalaya while north of the actual Himalaya Range. The range is about 500 km (311 mi) in length, and is the most heavily glaciated part of the world outside of the polar regions. The Siachen Glacier at 70 km and the Biafo Glacier at 63 km rank as the world's second and third longest glaciers outside the polar regions.

The Karakoram is bounded on the northeast by the edge of the Tibetan Plateau, and on the north by the Pamir Mountains. The southern boundary of the Karakoram is formed, west to east, by the Gilgit, Indus, and Shyok Rivers, which separate the range from the northwestern end of the Himalaya range proper as these rivers converge southwestward towards the plains of Pakistan.

Due to its altitude and ruggedness, the Karakoram is much less inhabited than parts of the Himalayas further east. European explorers first visited early in the 19th century, followed by British surveyors starting in 1856.

The Muztagh Pass was crossed in 1887 by the expedition of Colonel Francis Younghusband and the valleys above the Hunza River were explored by George Cockerill in 1892. Explorations in the 1910s and 1920s established most of the geography of the region.

The Karakoram and the Himalayas are important to Earth scientists for several reasons. They are one of the world's most geologically active areas, at the boundary between two colliding continents. Therefore, they are important in the study of plate tectonics. Mountain glaciers may serve as an indicator of climate change, advancing and receding with long-term changes in temperature and precipitation. These extensive ranges may have even caused climate change when they were formed over 40 million years ago. The large amounts of rock exposed to the atmosphere are weathered (broken down) by carbon dioxide. This process removes the greenhouse gas from the atmosphere, and could have caused the global climate to cool, triggering an ongoing series of ice ages.