(IMAGE) Université de Genève Caption A satellite image shows the morphologies of fossil rivers in southern Egypt. This study shows that these rivers were intensely active during the African wet period. Credit © Esri World Imagery Usage Restrictions none 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.