(CNN) - Monday marks the 40th anniversary of the eruption at Mount St. Helens.
Mount St. Helens erupted on May 18, 1980, killing 57. (Source: CNN)
The blast on May 18, 1980, killed 57 people and did more than $1 billion in damage.
The volcano in the Cascade Mountains is in Washington state, nearly 100 miles south of Seattle.
Mount St. Helens was recognized as a volcano in 1835. There have been at least four significant eruptions over the past five centuries.
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