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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Protecting Alaska
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US Coast Guard: Protecting us for 105 years
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Mountain hare hopping into Lunar New Year
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Welcome to the Hoh
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National Park Service Founders Day
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Khao Sok National Park in Thailand
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Composite image of a lunar eclipse
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Do spirits haunt the Gardens of Versailles?
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Village of Oia in Santorini, Greece
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Snow buntings take flight
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Lion cubs, South Africa
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Bluespotted ribbontail ray
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Haaga Rhododendron Park
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A cozy winter village
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Can you see the family resemblance?
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Nursing the world to health
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Join us in celebrating World Water Day
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It’s Opening Day for Major League Baseball
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National Take a Hike Day
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Santo Antão Island in the Republic of Cabo Verde
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Heron lies the Salton Sea
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A magnificent monolith
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Bridges to the past
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Katahdin Woods and Waters National Monument anniversary
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A horse of many colors
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Perfect timing
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Camel thorn trees, Namib-Naukluft Park, Namibia
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A lush, green escape
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Gentoo penguins in Antarctica
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Cross this bridge if you dare
Bing Wallpaper Gallery

