Mt. St. Helens: Mount Saint Helens, A volcanic peak in the CascadeRange, Mount St. Helens is situated in southwestern Washington State. Dormantsince 1857, it erupted on May 18, 1980, in one of the most violent volcaniceruptions ever recorded in North America.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-Category:SciencePaper Title:Mt. St. HelensText:Mount Saint HelensMount Saint Helens, A volcanic peak in the Cascade Range, Mount St. Helens issituated in southwestern Washington State. Dormant since 1857, it erupted on May18, 1980, in one of the most violent volcanic eruptions ever recorded in NorthAmerica.Order now
An explosive steam eruption on March 27, 1980, was followed by alternatingperiods of inactivity and minor eruption. A severe earthquake on May 18 opened acrack along the mountain’s north side. The north slope fell away in an avalanchethat was followed by a lateral air blast that carried hot gases, ash, and stoneoutward more than 12 from the summit. Landslides and magma flow flattenedsurrounding forests and carried debris as far as 17 miles away.
The blast reduced the volcano’s height by about 1,300 feet. A second majoreruption occurred on May 25, and magma formed a volcanic dome in the resultingcrater. The eruptions caused more than 30 deaths. After another eruption inApril 1981, experts expected that the volcano would remain active for some wherearound 20 years.
Mount St. Helens National Volcanic Monument covers about 110,000 acres. It isillegal for people to plant trees within these 110, 000 acres. Areas outside ofthe monument, however, have been replanted with trees.-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-