The rim of the pit crater at the cone volcano in the caldera of Volcano O. This crater is the prolific source of a sulfur particulate-rich plume, detected in several previous studies of the water column at Volcano O.

The rim of the pit crater at the cone volcano in the caldera of Volcano O. This crater is the prolific source of a sulfur particulate-rich plume, detected in several previous studies of the water column at Volcano O. Image courtesy of MARUM, University of Bremen and NOAA-Pacific Marine Environmental Laboratory.

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