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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Northern cardinal in winterberry bush
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Astronomy Day
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Ahh-tumn
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Presidents hear the echo of history
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A big place to shop small
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National Mountain Climbing Day
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Spine-cheeked anemonefish in Milne Bay, Papua New Guinea
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To Roswell, and beyond!
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Coming home to roost
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Let’s celebrate
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Swimming into the season
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Vancouver Coastal Sea wolves, Great Bear Rainforest, Canada
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Heceta Head Light, Florence, Oregon
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International Archaeology Day
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It s superb owl Sunday
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Happy St. Patrick’s Day!
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Coral Reef Awareness Week
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Summer solstice
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Celebrating Madagascar on its Independence Day
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World Elephant Day
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Groundhog Day arrives—beyond a shadow of a doubt
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A leafy seadragon in the waters off Wool Bay, Australia
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Make your list and check it twice
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One giant leap for penguins
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National Aviation Day
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Tour de France
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Torres del Paine National Park in Patagonia, Chile
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Burrowing owls
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Waiting for winter
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International Surfing Day
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