MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Folded rock strata by a lake. The strata were originally horizontal and planar. They formed from the gradual deposition of material. Over time the strata became uplifted and distorted by pressures within the Earth. The strata were then revealed by erosion. The folding and uplifting of rock is responsible for mountain forming (orogeny). Photographed in the Gran Sasso region of Italy.
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