(CNN/WFLA) – Monday marks 40 years since the Mount St. Helens volcano in Washington state exploded, leaving 57 people dead or missing.
The deadly blast did more than $1 billion in damage.
Mount St. Helens was recognized as a volcano in 1835. There have been at least four significant eruptions over the past five centuries.
The volcano is in the Cascade Mountains, nearly 100 miles south of Seattle.
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