Mohammad Golabi, University of Guam associate professor of soil and environmental sciences, explains how lysimeters are used to measure the environmental impact on groundwater for a composting experiment June 19, 2013, at the UOG Research Farm in Yigo, Guam. The professor, technicians and students collected nearly 250 cubic yards of mulch from Andersen Air Force Base, Guam, throughout the year for a project that will benefit the local agriculture community. (U.S. Air Force photo/Staff Sgt. Melissa B. White)