MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Antelope Canyon. Sand falling from the eroded sandstone walls of Upper Antelope Canyon, a slot canyon in Arizona, USA. The smooth angular surfaces of rock have been eroded by seasonal flash floods after thunderstorms, as the water, which contains sand particles. Localised turbulence and eddy patterns in the flow of water cut natural arches, curves and holes into the rock.
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