Joshua Roering, University of Oregon (IMAGE) University of Oregon Caption Joshua Roering studies geomorphology at the University of Oregon. His research with doctoral student Kristin Sweeney has documented how hill-slope processes combine with precipitation-driven processes to form orderly landscapes featuring ridges and valleys. Credit Photo by Charlie Litchfield Usage Restrictions Please include photo credit 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.