G. BRAD LEWIS / SCIENCE PHOTO LIBRARY G. BRAD LEWIS / SCIENCE PHOTO LIBRARY
Slot canyon with a potholer looking up at sunlight streaming through into the interior. Slot canyons are formed by flash flood water from occasional thunderstorms in arid areas. The water exploits cracks in the sandstone, forming deep canyons over thousands of years. The abrasive power of the water comes from the sand particles it carries. Photographed in Arizona, USA.
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