Prepping ice in the lab (IMAGE) Desert Research Institute Caption Carefully preparing the longitudinal ice core samples for high-resolution lead measurements (credit: Jessi LeMay/DRI) Credit Jessi LeMay/DRI Usage Restrictions For 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.