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https://www.noaa.gov/media/digital-library-photo/pl23expl0044jpgDescription
Pacific Ring of Fire Expedition. Columnar jointing in pumice boulder on thetop of West Rota volcano. Note crinoid growing on the surface. Theimage is approximately 0.5 meters [18 in] high. (Image credit: Pacific Ring of Fire 2004 Expedition. NOAA Office of Ocean Exploration; Dr. Bob Embley, NOAA PMEL, Chief Scientist)