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Pacific Ring of Fire Expedition. While attempting to sample an outcrop ofhydrothermally altered lava, the view changed rapidly (over a 2 minute time span) from good visibility to chunks of rock, sulfur and ash totallyobscuring the outcrop from our view . The outcrop is ~ 40 cm high. This view is is midway in the process. (Image credit: Pacific Ring of Fire 2004 Expedition. NOAA Office of Ocean Exploration; Dr. Bob Embley, NOAA PMEL, Chief Scientist)