SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Sandstone hoodoo amongst sandstone pillars. A hoodoo (centre) is an erosional feature that formed as the result of differential erosion. The pillar is capped by a piece of rock that protects it from erosion. The unprotected material is eroded by occasional heavy rains, gradually forming a spire. Photographed in Tahaggar, southern Algeria.
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