Science in the Snow (IMAGE) U.S. National Science Foundation Caption Science in the snow: Downloading data on trees and snowmelt at the Southern Sierra CZO. Credit NSF Southern Sierra Critical Zone Observatory 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.