Joshua Roering, University of Oregon (IMAGE) University of Oregon Caption Joshua Roering, a geologist at the University of Oregon, directed a National Science Foundation-funded study that suggests much of North America's non-glaciated landscape was much colder than long thought and experienced erosion from frost-cracking at a rate some 2.5 times that seen today. Credit Photo by Charlie Litchfield 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.