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Description
Pacific Ring of Fire Expedition. The vertical column in the centerof the image, called a dike, rises from below sea level to the pinnacle at thetop of the ridge. Interlaid massive lavas (darker horizontal bands)and ash-rich lava units (reddish) are also exposed on the islets of Maug. (Image credit: Pacific Ring of Fire 2004 Expedition. NOAA Office of Ocean Exploration; Dr. Bob Embley, NOAA PMEL, Chief Scientist)