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This news could serve as a warning to millions of Americans if they are wise....
"There are 65 volcanoes in the United States and its territories that scientists consider active, including Mount St. Helens. Of those volcanoes, 12 are on alert, which means they are on heightened watch for eruptive activity, and two are erupting right now or expected to erupt shortly."
"Here are the seven most dangerous volcanic areas in the U.S., according to the USGS Volcano Hazards Program's Volcano Alerts watch list:"
Which U.S. Volcanoes Are Most Dangerous Right Now? - Yahoo! News (http://news.yahoo.com/s/livescience/20100517/sc_livescience/whichusvolcanoesaremostdangerousrightnow - broken link)
(It's interesting to note that Earthquakes often precede a volcano's eruptions. There has been a flurry of Earthquakes near the listed volcano's recently.)