BOB GIBBONS / SCIENCE PHOTO LIBRARY BOB GIBBONS / SCIENCE PHOTO LIBRARY
River flowing over travertine deposits at Plitvice National Park, Croatia. Travertine is a mineral precipitated from streams super- saturated with bicarbonates. The environmental conditions leading to the formation of such dams are quite specific. It is aided by the presence of mosses, algae and bacteria. The park is a UNESCO World Heritage Site. Photographed in October.
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