Critical Zone Observatories (IMAGE) U.S. National Science Foundation Caption NSF's network of Critical Zone Observatories stretches from coast to coast across North America. Credit NSF/CZO Usage Restrictions None 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.