Covington moulin 2 (IMAGE) University of Arkansas Caption University of Arkansas associate professor of geosciences Matt Covington investigates a moulin on the Greenland ice sheet. Credit Jason Gulley 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.