Photo1 (IMAGE) Desert Research Institute Caption Photo 1 shows a U.S. ice core driller collecting a core used in this study as part of the Norwegian-U.S. scientific traverse of East Antarctica. Credit Credit: Stein Tronstad Usage Restrictions Use with credit License Original 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.