Deformed Till (IMAGE) Iowa State University Caption This photo shows how experiments to simulate the huge forces involved in glacial flow deform the till underneath a ring of ice. The beads were placed vertically in the till -- a glacially deposited mix of mud, sand and rock particles -- but have been moved by the motion of ice. Credit Photo by Lucas Zoet 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.