DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Eroded rock pillars. These pillars, an example of differential erosion, are a geological feature known as hoodoos. They are formed by wind erosion of loose sandstone, which has formed over harder, more resistant sandstone. Photographed on the banks of the Chilcotin River, in Farwell Canyon, British Columbia, Canada.
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