Microorganisms Colonize Gypsum Rock (IMAGE) U.S. Army Research Laboratory Caption Microorganisms (highlighted in green) colonize gypsum rock (highlighted in purple) to extract water from it. An Army-funded project showed how microorganisms are able to eke out an existence by extracting water from the rocks they colonize. Credit Courtesy David Kisailus, University of California - Irvine) 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.