Acidic Soils (IMAGE) University of Adelaide Caption Acidic (pH 4) and iron rich (indicated by orange-brown colour) water in a wetland following exposure during drought Credit Luke Mosley Usage Restrictions For use with this story only 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.