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In the middle 1800s, a number of small eruptions took place
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Between 1832 and 1857, St Helens puffed out clouds of steam and ashes from time to time.
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Mount Hood active 7,000-1,000 years B.P
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Mount Baker active durning last 200 years
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In 1975, two geologists finished a study of the volcano's past eruptions
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With the earthquake of March 20 1980, Mount St. Helens woke from a sleep of 123 years
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Mount St. Helens partally covered with volcccanic ash, April 1980
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An eruption on March 19, 1982, melted snow and caused this mudflow. The smaller part of the flow went into Spirt Lake, while the larger part traveled down the Toutle River
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Arnica flowers blooming on the Lang Ridge in 1984, four years after the eruption of Mount St. Helens