Water and Soil Samples (IMAGE) Proceedings of the National Academy of Sciences Caption Cadillo-Quiroz takes water and soil samples at a study site in the Amazon, near Iquitos, Peru. Credit Sandra K. Leander (Arizona State University, Tempe, AZ). 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.