Mysteries of the Atacama Desert/The Oldest Desert On Earth

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The Atacama Desert is commonly known as the driest non-polar place in the world, especially the surroundings of the abandoned Yungay town[20] (in Antofagasta Region, Chile).[21] The average rainfall is about 15 mm (0.6 in) per year,[22] although some locations, such as Arica and Iquique, receive 1 to 3 mm (0.04 to 0.12 in) in a year.[23] Moreover, some weather stations in the Atacama have never received rain. Periods of up to four years have been registered with no rainfall in the central sector, delimited by the cities of Antofagasta, Calama and CopiapĆ³, in Chile.[1] Evidence suggests that the Atacama may not have had any significant rainfall from 1570 to 1971.[5]

Wild donkey in the Atacama desert.
The Atacama Desert may be the oldest desert on earth, and has experienced extreme hyperaridity for at least 3 million years, making it the oldest continuously arid region on earth. The long history of aridity raises the possibility that supergene mineralisation, under the appropriate conditions, can form in arid environments, instead of requiring humid conditions.[24] Geological research suggests that in some sections of the Atacama Desert, such as in today’s Chile, hyperaridity has persisted for the last 200 million years (since the Triassic), competing only with Africa’s Namib Desert for such a title.

This desert is so arid, many mountains higher than 6,000 m (20,000 ft) are completely free of glaciers. Only the highest peaks (such as Ojos del Salado, Monte Pissis, and Llullaillaco) have some permanent snow coverage.

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Date: July 5, 2017