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Volcanoes How they change the surface of Earth!. Before eruptionAfter Eruption Mt. Saint Helens A volcano is a weak spot in the crust where magma is expelled

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Mount St. Helens a decade after the 1980 eruptions ......Even before the catastrophic eruption of 18 May 1980, Mount St. Helens was known to be frequently active and explosive and

Mount St. Helens a decade after the 1980 eruptions ......Even before the catastrophic eruption of 18 May 1980, Mount St. Helens was known to be frequently active and explosive and

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Mount St Helens May 18th 1980 Eruption

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