Ramp Cartoon (IMAGE) Penn State Caption Diagram of pukao emplacement scenario that is supported by analysis of pukao form and the physics associated with pukao transport. Credit Sean Hixon Usage Restrictions Non commercial use only 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.