MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Karst erosion of limestone in the Prati di Tivo region of the Italian Apennine mountains. Karst erosion is a type of erosion that occurs when rainwater dissolves some of the rock that it lands on, forming numerous holes in the rock. Karst landscapes are typically riddled with caves, underground streams, vertical shafts, sinkholes and springs.
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