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Nevado Ojos del Salado is a massive stratovolcano in the Andes on the Argentina–Chile border and the highest active volcano in the world at . It is also the second highest mountain in the Western Hemisphere and Southern Hemisphere and the highest in Chile. It is located about north of Aconcagua, the highest mountain in the Western Hemisphere at . Due to its location near the Atacama Desert, the mountain has very dry conditions with snow usually only remaining on the peak during winter, though heavy storms can cover the surrounding area with a few feet of snow even in summer. Despite the generally dry conditions, there is a permanent crater lake about in diameter at an elevation of on the eastern side of the mountain. This is most likely the highest lake of any kind in the world. The ascent of Ojos del Salado is mostly a hike except for the final section to the summit which is a difficult scramble that may require ropes. The first ascent was made in 1937 by Jan Alfred Szczepański and Justyn Wojsznis, members of a Polish expedition in the Andes. Its name comes from the enormous deposits of salt that, in the form of lagoons or “eyes”, appear in its glaciers.〔(【引用サイトリンク】title=Los 6000 de Chile )〕 ==Volcanic activity== There is no doubt that Ojos del Salado is a recently active volcano, but the question of whether it should be considered ''currently'' (or "historically") active is arguable. According to the Smithsonian Institution's Global Volcanism Program, the most recent known eruption was around 1300 years ago, with large error bars. However, there is also some evidence for a minor ash emission in 1993, which would definitely qualify the volcano as historically active. The presence of fumaroles high on the mountain and recent-looking lava flows, albeit of uncertain age, also argues in favor of a categorization as "active." By these definitions Ojos del Salado is the highest historically active volcano on earth. If the older date is accepted, the title of "highest historically active volcano" might reside instead with the somewhat lower Llullaillaco volcano, which certainly has erupted in historic times (most recently in 1877) and should still be considered active. Its last eruption was 1000-1500 years ago 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ojos del Salado」の詳細全文を読む スポンサード リンク
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