Sastrugi in Antarctica (IMAGE) University of Arizona Caption Antarctica is covered with sastrugi -- concrete-hard snow drifts -- for thousands of miles in every direction. Credit Kelly Brunt, courtesy National Science Foundation Usage Restrictions The photo credit must accompany this photo. This photo may not be used for personal or commercial profit or for advertisement. 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.