Mount St. Helens
Mount St. Helens showed important new activity on March 8, 2005, when a 36,000-foot (11,000 m) plume of steam and ash came from the volcano. The plume was seen from as far away as Seattle, a city that is 96 miles away. This fairly small eruption took place because of a new lava dome being formed and a 2.5 magnitude earthquake.