Aerial view of part of the 5 km-wide, ice-filled caldera of Mount Wrangell, a 4,317-m (14,163 ft)-high andesite shield volcano. Historical activity consists of several minor eruptions in the early 1900s. An active fumarole can be seen on the caldera rim. Photograph by R. Motyka, Alaska Division of Geological and Geophysical Surveys, 1981.

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