Andriuzzi, Colorado State University (IMAGE) Colorado State University Caption Walter Andriuzzi takes a soil sample in the McMurdo Dry Valleys in December 2016. He steps on rocks to avoid disturbing the ground. Credit Ross A. Virginia, Dartmouth College 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.