Our Colorful Earth, Petrified Forest National Park, Arizona, United States

Photograph by Nick Zantop

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A rainbow of colorful sand and rock stretches out under a sapphire sky as far as the eye can see. Arizona’s Painted Desert gets its incredible coloration from stratified layers of easily erodible shale, siltstone, and mudstone dating to the Triassic – over two hundred million years ago. 

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