Arc Volcano Researchers (IMAGE) University of Washington Caption Co-authors Yan Hu (l) and Fang-Zhen Teng with the MC-ICP-MS machine (right) that turns basalt into a plasma, in which electrons are separated from each atom's nucleus, to discover tiny variations in the rock's chemical makeup. Credit Dennis Wise/University of Washington Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.