Grand Canyon, USA. (image) Geological Society of America Caption A figure stands on Esplanade surface opposite Vulcan's Throne volcano, Grand Canyon, USA. Photo by J.W. Sears. Credit Photo by James W. Sears Usage Restrictions Credit to photographer J.W. Sears 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.