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Okmok Volcano, USA
Steam rises in December 1980 from a cinder cone in Alaska's Okmok caldera.
Known only as Cone A, it is one of numerous unnamed pyroclastic cones within the 10-km-wide caldera.
Erosional furrows produce linear stripes on the flank of the cone.
Eruptions from Cone A in 1945 and 1958 produced lava flows, which issued onto the caldera floor.
Cone A erupted again six months after the date of this photo.
The wall of Okmok caldera forms the skyline ridge.
PHOTO SOURCE: Chris Nye 1980, Alaska Division of Geological & Geophysical Surveys, Alaska Volcano Observatory, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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