Scientists have been using EarthScope's instruments to study the super-volcano underneath Yellowstone National Park. The movie on the left below shows the plume of magma imaged by the EarthScope data and shows that the plume is many times larger than the Yellowstone caldera on the surface. Don't worry, it's not about to erupt!
The colors in Grand Prismatic Spring are caused by bacterialiving in the water heated by the Yellowstone hotspot