TONY CRADDOCK / SCIENCE PHOTO LIBRARY TONY CRADDOCK / SCIENCE PHOTO LIBRARY
Wind erosion. Cavities in sandstone rock, created by the erosive effect of desert wind. In desert areas, the wind carries many fine sand particles. These are very abrasive, and can cause serious erosion to sedimentary rocks such as sandstone. The points where the cavities form may start out as small faults. These faults concentrate the 'blast' effect of the wind, which selectively erodes the rock surrounding them. Photographed in the Valley of Fire, Nevada, USA.
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