Snowy White Moulin (IMAGE) University of Washington Caption An opening reveals a conduit -- called a moulin -- that carries meltwater through the ice sheet sometimes all the way to bedrock where the meltwater can act as a lubricant moving the ice. Meltwater is a more important force behind the slipping of the slow-moving Greenland Ice Sheet than it is for Greenland's fast-moving outlet glaciers, new research shows. 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.