Water Streams to Moulin (IMAGE) University of Washington Caption Meltwater carves two troughs, each roughly 20 feet deep, in the Greenland Ice Sheet before disappearing into a moulin, a conduit that carries the meltwater through more than half a mile of ice. Meltwater that reaches bedrock can increase the speed at which the ice is moving, a contribution that is more pronounced under the Greenland Ice sheet than under Greenland's faster-moving outlet glaciers, new research in Science Express says. Credit I. Joughin/UW Polar Science Center Usage Restrictions Photo credit required 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.