On May 18, 1980, the United States experienced the deadliest and most destructive volcanic eruption in its history.

Michael Cairns flew a National Guard helicopter on a rescue and recovery mission to Mount St. Helens. His book, "Under the ...

Entire forests became matchsticks. In the avalanche, 14 miles of the North Fork Toutle river were buried under an average of 150 feet, in some places 600 feet, of rock, sludge, mud and trees.