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The snow-covered Klyuchevskaya Volcano on Russia's Kamchatka Peninsula part of the highly volcanically and seismically active Pacific "Ring of Fire." Klyuchevskaya the largest active volcano in the Northern Hemisphere is seen here erupting in March 2010.
The volcanic plume, low-lying clouds and snow are all white in the image taken by NASA's Earth Observing-1 satellite, while a lava flow on the shadowed (northern) flank of the mountain is nearly black.
The 15,863-foot (4,835-meter) high volcano has erupted nearly continuously since it first formed about 6,000 years ago.