About 30 million years ago, a disturbance in the transition zone, likely related to mantle flow, led magma from the zone to surge toward Earth's surface
“We found a new way to make volcanoes,” study senior researcher Esteban Gazel, an associate professor in the Department of Earth and Atmospheric Sciences at Cornell University, said in a statement. “This is the first time we found a clear indication from the transition zone deep in the Earth’s mantle that volcanoes can form this way.”
