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.
Date: 2004 April
Credit: Pacific Ring of Fire 2004 Expedition. NOAA Office of Ocean Exploration; Dr. Bob Embley, NOAA PMEL, Chief Scientist
Location: Mariana Arc region, Western Pacific Ocean
Subject: Ocean exploration