Mongol Els Sand Dunes (IMAGE) Max Planck Institute of Geoanthropology Caption Die Sanddünen von Mongol Els ragen aus der mongolischen Steppe heraus. Viele dieser Wüsten, die eine natürliche Barriere darstellen, entstanden erst nach dem letzten glazialen Maximum (vor ca. 20 000 Jahren). Credit Nils Vanwezer Usage Restrictions This image may only be used in the context of reporting on this publication and with appropriate credit information. 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.