Steam and volcanic gas rising from the summit crater of 2,519-m (8,264 ft)-high Pavlof Volcano on the Alaska Peninsula. Pavlof is one of the most active of Alaska's volcanoes with nearly 40 historical eruptions.
Photograph by T. Miller, U.S. Geological Survey, November, 1973. Source: http://geopubs.wr.usgs.gov/dds/dds-40/
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