BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Painted Desert, Arizona. Aerial photograph of the Painted Desert in Arizona, USA. This landscape was formed from sediments deposited by rivers around 200 million years ago. The bright colours in the strata are the result of mineral-rich volcanic ash, which were deposited by the prehistoric rivers, reacting with oxygen.
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