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TEMPERAMENTAL PEAKS. The concentrations of dissolved gases in a volcano's molten rock largely determine whether an eruption is explosive, like the Mount St. Helens eruption of May 18, 1980 (above, in close-up), or effusive, like the eruption at Hawaii's Kilauea, which has been going on for more than 2 decades (below). Credit: D. Swanson, USGS
Found in: Earth Science

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