Steam Rises from Yellowstone Geyser

Steam sprews from a hot pool of water in Yellowstone, the nations first National Park spanning three states.<br />
The Yellowstone Caldera is the largest volcanic system in North America. It has been termed a "supervolcano" because the caldera was formed by exceptionally large explosive eruptions.<br />
There are 300 geysers in Yellowstone and a total of at least 10,000 geothermal features altogether. Half the geothermal features and two-thirds of the world's geysers are concentrated in Yellowstone.[37]