Grand Prismatic Hot Spring (image) University of Utah Share Print E-Mail Caption The gorgeous colors of Yellowstone National Park's Grand Prismatic hot spring are among the park's myriad hydrothermal features created by the fact Yellowstone is a supervolcano - the largest type of volcano on Earth. A new University of Utah study reports discovery of a huge magma reservoir beneath Yellowstone's previously known magma chamber. That doesn't increase the risk of an eruption, but means scientists are getting a better view of Yellowstone's volcanic plumbing system. Credit "Windows into the Earth," Robert B. Smith and Lee J. Siegel Usage Restrictions Credit required. Share Print E-Mail 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.