What Causes A Volcanic Eruption?

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What causes the world's explosive volcanic eruptions, like the 1980s blast at Mount St. Helens, to occur? USGS

A team of volcanologists led by the University of Liverpool have released a perhaps controversial Nature study on the causes of volcanic eruptions. Going against the current consensus, they have suggested that it isn’t huge pressure differences that trigger volcanic blasts, but a strange behavior of magma called “frictional heating.”