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Mount St. Helens volcano. Hand coloured photograph of the ash plume rising from the Mount St. Helens volcano during an eruption in 1980. The volcano had been dormant since 1857 but began to show activity again early in 1980. On 18 May 1980 it exploded and sent a plume of ash to an altitude of 19 kilometres. The eruption killed everything, including about 60 people, within an area of 180 square kilometres, and spread ash over a much wider area. The eruption blew off about three cubic kilometres of the volcano, reducing its height from 2,950 metres to 2,549 metres. Mount St. Helens lies in the Cascade Range of mountains in Washington State, USA.
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