Breaking the Ice (IMAGE) Columbia Climate School Caption Ordinarily, ice sheet layers come in smooth, undulating layers, as seen in the top portion of this image. The chaotic squiggles near the base of the ice sheet were a surprise. Credit Kingslake et al., <i>Nature</i> 2018 Usage Restrictions None 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.