Yellowstone National Park's Grand Prismatic Spring, the park's largest hot spring, makes for a stunning photo in this aerial shot.
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Underneath the picturesque Yellowstone National Park, in the U.S. state of Wyoming, is a supervolcano with the potential to change life on Earth.
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Dr Bob Smith believes a supervolcano eruption under Yellowstone would cover the western U.S with ash that would also enter the jet stream potentially crippling air travel and the world's food supply.
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Old Faithful is one of Yellowstone's most popular geological features. Underground is an enormous plume of very hot rock which fuels every bubbling pool and geyser in the park.
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Scientists at the Yellowstone Volcano Observatory at the University of Utah are constantly monitoring the underground supervolcano for ground movements and earthquake activity.
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They measure seismic readings of the frequent earthquakes happening in and around Yellowstone National Park. Earthquakes can be indicators to when the next supervolcanic eruption would occur.