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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Merry Christmas
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Merry Christmas!
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Aerial view of the Colorado River Delta in Mexico
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Bearded reedlings in Flevoland
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And to think that I saw it in Cappadocia
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Canada s $20 view
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Wicker fields in Cañamares, Spain
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Lunar eclipse
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World Environment Day
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A day of service for Dr. King
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Boxing Day—a shopper’s delight
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Winterpret on ice
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Vila Franca Islet, São Miguel Island, Azores, Portugal
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National Pearl Harbor Remembrance Day
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Tide pools in La Jolla, California
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Bridge of Hillsborough County
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A dying breed of tree thrives in an American park
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Great Fountain Geyser, Yellowstone National Park, Wyoming
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World Bee Day
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Halo around the sun
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We have liftoff!
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Poinsettia Day
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Jasper Dark Sky Festival
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It’s Draw a Bird Day
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A growing business
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Fog above the forest
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Hungarian Parliament Building, Budapest, Hungary
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In celebration of cats
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Baltic Sea, Estonia
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Pi Day
Bing Wallpaper Gallery

