Erebus Volcano, Antarctica

The summit of Antarctica's Mount Erebus, the world's southernmost historically active volcano, contains an elliptical, 500 x 600 m wide crater whose NE side is cut by the 250-m-wide Inner Crater.

The flat, snow-covered floor of the Main Crater lies about 100 m below its rim.

Steam rises from the steep-walled, 100-m-deep Inner Crater, which has a phonolitic lava lake that has been active since 1972.

PHOTO SOURCE: Bill Rose 1983, Michigan Technological University, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.

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