Volcanic Plume (IMAGE) U.S. National Science Foundation Caption This picture shows two mechanisms for generating rotation in a volcanic plume. Credit Zina Deretsky, National Science Foundation, after Chakraborty et al., Volcanic mesocyclones, Nature, 3/26/09 Usage Restrictions None 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.