Withered Tree (IMAGE) National Geographic Society Caption A withered tree speaks of an earlier time in this expanse of the once-fertile Colorado River Delta. Credit Erik Rochner / National Geographic Usage Restrictions IMAGE IS FOR YOUR ONE-TIME EXCLUSIVE USE. NO SALES. NO TRANSFERS. 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.