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On March 16, 1980, the first sign of activity at Mount St. Helens occurred as a series of small earthquakes. On March 27, after hundreds of earthquakes, the volcano erupted for the first time in 100 years. Steam explosions blasted a 200- to 250-ft wide crater through the volcano and covered the mountain with dark ash.
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There are many factors that determine what kind of lava flow will occur and what type of volcano it will be. The amount of gas trapped in the lava, the kinds of minerals making up the lava, and how much pressure can be trapped in the area all affect the eruption and formation of the volcano.
Fun Fact: The word volcano originally comes from the name of the Roman god of fire, Vulcan.