Colorful ice surrounds Lower Yellowstone Falls in winter in Yellowstone National Park, Wyoming. Lower Yellowstone Falls plunges 308 feet (94 meters) and is the highest-volume waterfall in the Rocky Mountains. Some of the unusual coloring on the ice is the result of mineral-rich rock dust that has been eroded and deposited by the Yellowstone River. The blue icicles result from the ice being uniform and free of bubbles, so it reflects only blue wavelengths of light.
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