Oman (IMAGE) University of Bonn Caption Large parts of Oman are very dry today. The annual rainfall was probably much higher about 8,000 years ago. Credit © Valeska Decker/University of Bonn Usage Restrictions Please use this image only in connection with the press release. 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.