Model Still (IMAGE) University of Texas at Austin Caption The source-to-sink model illustrating elevation (left) and erosion/deposition (right). Credit Jinyu Zhang/ The University of Texas at Austin. Usage Restrictions 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.