Mount St. Helens sends a huge column of steam and ash skyward, one day after scientists warned an eruption was imminent. The Washington state mountain was the site of a catastrophic surprise eruption in 1980.
Before Friday's mild eruption, Mount St. Helens had lain dormant for 18 years. Experts say the eruption did not pose a threat to public safety. Hear NPR's Craig Windham.
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