In September of 2004, Mount St. Helens returned to life after 18-years of quiescence. The slow moving, dome building eruption extruded a dump truck load of lava into the crater per second and continued for three and one-half years. Time-lapse cameras installed by the US Geological Survey recorded the successive growth and collapse of lava spines as the volcano built a pile of lava taller than the Empire State building.
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Courtesy of the U.S. Geological Survey