Geology Cartoon (IMAGE) University of Washington Caption The Washington coast is geologically complex. The bubbles emerge from a region off the coast above where the Juan de Fuca ocean plate plunges beneath the North American continental plate. Credit Paul Johnson/University of Washington Usage Restrictions With 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.