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The June 29, 1991 eruption column from Mount Pinatubo with Marella River Valley. Aerial view to north of pyroclastic-flow deposits in Marella River valley (in foreground) and tributaries of Balin Buquero River (in distance) with ash plume rising from Pinatubo�s caldera. Pyroclastic-flow deposits to east of isolated hill in right center as about 200 meters thick. Dark streaks on pyroclastic-flow deposits are lahar deposits generated by rains. U.S. Geological Survey Photograph taken on June 29, 1991, by Ed Wolfe.
http://vulcan.wr.usgs.gov/Volcanoes/Philippines/Pinatubo/images.html Image resized
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