Sunrise image of the Mammoth Hot Springs near the northern entrance to Yellowstone National Park in Wyoming. The early morning light adds to the already very colorful formations. They were created over thousands of years as hot water from the spring cooled and deposited calcium carbonate (over two tons flow into Mammoth Hot Springs each day in a solution). Although these springs lie outside the caldera boundary, their energy has been attributed to the same magmatic system that fuels other Yellowstone geothermal areas.
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