As National Park Week continues, we"re turning our attention to the vivid colors of the Grand Prismatic Spring in Yellowstone National Park. Its intense rainbow hues are formed by cycles of hot water rising, cooling, and falling—creating rings of distinct temperatures inside the spring. The clear, blue center is the hottest part, with almost nothing living in it. But the other rings are home to various microorganisms that produce bands of distinct colors ranging from green to orange to red.
Where do those colors come from?
Today in History
More Desktop Wallpapers:
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On the Route of the Waterfalls
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A crane for good luck in today’s big game
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Here s looking at you
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Let’s have a ball
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Astrotourism at its finest
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US Coast Guard: Protecting us for 105 years
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Sutherland Falls in Fiordland National Park
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Put your helmet on, we’re going for a hike
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Autumnal equinox
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Lick Observatory
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Once upon a midafternoon dreary…
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Great Sand Dunes National Park and Preserve
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Art in the chapel
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Waiānapanapa State Park, Maui, Hawaii
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Helloooooo, Innsbruck
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Kagami-ike, Nagano, Japan
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‘Hello’ from zero degrees longitude
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Skógafoss waterfall, Iceland
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Bathing boxes at Brighton Beach, Australia
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Avatar Mountains, Zhangjiajie National Forest Park, China
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Indigo bunting
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It’s Draw a Bird Day
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Stari Most in Mostar, Bosnia and Herzegovina
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Superbloom in Carrizo Plain National Monument, California
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Remembering the Velvet Revolution
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A day to celebrate teachers
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Going head-to-head with winter
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Satla marshland in Bangladesh
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Pasadena Chalk Festival supports local arts education
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Lake Peipus, Estonia