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Pacific Ring of Fire Expedition. Fluffy white bacterial mat covers yellowcorals and the surrounding rocks near the shallow summit ofEast Diamante volcano. The corals are dependent on sunlight whereasthe mat uses the chemical energy from hydrothermal fluids seeping out of thevolcano. (Image credit: Pacific Ring of Fire 2004 Expedition. NOAA Office of Ocean Exploration; Dr. Bob Embley, NOAA PMEL, Chief Scientist)