Credit: RICHARD WAREHAM FOTOGRAFIE/SCIENCE PHOTO LIBRARY

Caption: Waterfall at Gordale Scar, a limestone ravine cut into the Yorkshire Dales, England, UK. This region is made up of Carboniferous-period limestone, laid down around 350 million years ago. Subsequent weathering and erosion by rainwater and glacial action has formed a region of classic karst topography, featuring numerous caves and sinkholes, as well as limestone pavements and valleys.

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