National Parks/Geysirs and Volcanoes

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Yellowstone NP sits atop a volcanic hot spot.

Grand Prismatic Spring

Grand Prismatic Spring from an overlook

The Grand Prismatic Spring is the largest hot spring in the United States and was noted by geologists working in the Hayden Geological Survey of 1871, and named by them for its striking coloration. Its colors match the rainbow: red, orange, yellow, green, and blue.



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