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Pacific Ring of Fire Expedition. Thick orange bacterial mat found near thesummit of Northwest Eifuku volcano grow where warm hydrothermal vent fluidsseep out of the seamount. The orange color reflects the factthat iron is coming out in the vent fluids. (Image credit: Pacific Ring of Fire 2004 Expedition. NOAA Office of Ocean Exploration; Dr. Bob Embley, NOAA PMEL, Chief Scientist)