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How long did the 1980 eruption of Mount St Helens last for?

April 26, 2017eruption Geography Helens Mathematics mount st

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How long did the 1980 eruption of Mount St Helens last for?

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It depends on what you mean by eruption – The time it took for the north face of the mountain to slide away was just a few seconds, but the ash cloud that the volcano emitted continued to rise and grow for 10 hours.