Withered Tree (image) National Geographic Society Share Print E-Mail 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. Share Print E-Mail 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.