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Mount St. Helens: On October 1, 2004, ash and steam signaled the beginning of a new lava dome eruption. By February 22, 2005, the unusual “whaleback” dome, seen here, had grown to 1600 feet long, 500 feet wide, and 530 feet higher than the old 1986 dome. U. S. Geological Survey photo by Steve Schilling.