More on Mount Saint Helens from Fact Monster:

• Mount Saint Helens - Dormant since 1857, Mount St. Helens erupted on May 18, 1980 in one of the largest volcanic explosions in North American history.
• Mount Saint Helens - Saint Helens, Mount Saint Helens, Mount, volcanic peak, 8,363 ft (2,549 m; 9,677 ft/2,950 m before ...
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• Encyclopedia: U.S. Physical Geography - Encyclopeadia articles concerning U.S. Physical Geography.

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