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historicalmarkerproject/markers/HMY8L_mount-st-helens-you-are-edge-of-the-blast-zone_Toutle-WA.html
The eruption of Mount St. Helens on May 18, 1980 triggered a huge landslide causing a powerful, laterally directed blast. A pyroclastic flow consisting of rock fragments, highly charged gas and super heated steam, devastated almost 150,000 acres o…
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