Photo: Mount St. Helens May Erupt for Decades, Scientists Suggest

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Mount St. Helens sends up a plume of steam in April 2005, six months after its current eruption began. Some scientists say the volcano could continue to erupt for decades, perhaps even centuries, if it is part of a so-called open system, in which the volcano is constantly resupplied with magma.

Photograph courtesy USGS

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