West Greenland Ice Core (IMAGE) Dartmouth College Caption Ice cores from the West Greenland Ice Sheet 'percolation zone' were studied under a light table at Dartmouth’s Ice Core Laboratory to reveal ice layers that tell the history of how much melt has occurred through time. Credit Robert Gill/Dartmouth College Usage Restrictions Usage is unrestricted in coverage related to this research with proper 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.