The caldera located in Yellowstone National Park, has erupted three times in history , 2.1 million years ago, 1.2 million years ago and 640,000 years ago.
Volcanoes typically blow when molten rock, known as magma, rises to the surface following the Earth’s mantle melting due to tectonic plates shifting.
However, geologists have revealed how Yellowstone's magma chamber, which sits on top of the magma plume, is slowly rising each year.
Should it continue at this rate, it is possible magma could break through the Earth’s crust – forming flowing lava.
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