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Large areas of the summit of Northwest Eifuku volcano were covered with orange bacterial mats. These mats are the byproducts of hydrothermal microbes growing in areas where warm water seeps out of the volcano. On steep slopes, the mats sometimes cascade downhill as "bacteria balls."

 

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Submarine Ring of Fire 2004

Submarine Ring of Fire 2004: April 12 Log

NOAA Ocean Explorer Gallery