Patricia Gregg, University of Illinois at Urbana-Champaign (IMAGE)

University of Illinois at Urbana-Champaign, News Bureau

Patricia Gregg, University of Illinois at Urbana-Champaign

Caption

Supervolcanoes are likely triggered externally when the rock around them cracks or collapses, according to a study led by Illinois geologist Patricia Gregg.

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Photo by L. Brian Stauffer

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