DAVID WEINTRAUB / SCIENCE PHOTO LIBRARY DAVID WEINTRAUB / SCIENCE PHOTO LIBRARY
Mount St Helens. Giant volcanic ash cloud formed by the eruption of Mount St Helens, Washington State, USA, on 22nd July 1980. This explosive event threw ash up to an altitude of 18km in the space of eight minutes. This eruption occurred about two months after the major eruption of 18th May 1980, when some 3 cubic kilometres of the volcano were blown away. A lateral blast of dense, debris-filled steam clouds burst away from the volcano at speeds of up to 400 kilometres per hour, devastating more than 500 square kilometres of land.
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