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Yes, the eruption of Mount Saint Helen's killed roughly everything and every one downhill from the landslide. It created a wave of hot abrasive mud that scraped off trees, roads and bridges, buried thousands of acres of rivers, lakes and forests. It polluted the rivers all the way to the coast and into the Pacific Ocean. It coated plant life for 300 miles downwind with a lethal caustic burning dust, suffocating or starving local animals. 57 people were killed as a result of the eruption. Of these, 21 bodies were never recovered from the blast zone.

It created a 5.1 (Richter scale) earthquake centered beneath the mountain. The massive ash cloud grew to 80,000 feet (18 kilometers) in 15 minutes and reached the east coast in 3 days. Although most of the ash fell within 300 miles of the mountain, finer ash circled the earth in 15 days and may continue to stay in the atmosphere for many years.

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15y ago

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