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Kliuchevskoi Volcano, Russia
Kamchatka's two highest volcanoes rise above a sea of clouds.
Their greatly differing morphologies reflect contrasting geologic histories.
Construction of extensively eroded Kamen volcano (left) took place during the Pleistocene.
Its eastern (right) side was removed by a massive landslide about 1200-1300 years ago, leaving the steep escarpment.
Symmetrical Kliuchevskoi, in contrast, is one of Kamchatka's youngest and most active volcanoes, growing to 4835 m in the past 6000 years.
PHOTO SOURCE: Yuri Doubik, Institute of Volcanology Petropavlovsk, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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