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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Feeling crabby?
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Star Wars Day
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In praise of bogs, swamps, and marshes
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Pamukkale, Turkey
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The desert blooms
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Salmon migration in full swing
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Muir Woods National Monument anniversary
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Dunluce Castle, County Antrim, Northern Ireland
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Hidden beauty in Thailand
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San Francisco’s City Hall illuminated by the iconic colors of Pride
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Happy Astronomy Day!
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Exploring the Pearl of the Atlantic
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Happy New Year!
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What s better than a smile?
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Sweet! It’s maple syrup season
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King of the dinosaurs
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Endangered Species Day
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Groundhog Day
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And they’re off!
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European Day of Parks
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Welcome to the pack
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Signs of life in the Empty Quarter
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Rosa Parks Day
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Illuminating Annecy
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Next stop, Tofino
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The Children’s Cultural Festival in Reykjavik begins today
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Arromanches-les-Bains for the 81st anniversary of D-Day
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A place called ‘Peace’ in India
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Why, aloe there
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Whoopin it up!
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