Ice core sample (IMAGE) University of Colorado at Boulder Caption Scientists around the world use ice cores—cylindrical columns of ice, drilled from ancient ice sheets—gathered from the poles to study Earth’s past climate. Credit Bradley Markle Usage Restrictions Credit required 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.