BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Folded rock strata seen in a cliff. The strata, or layers of a rock, are seen as horizontal bands running across the exposed cliff face. A fold (upper centre) in the strata is evidence of the tectonic forces within the Earth's crust which have buckled and crumpled the originally horizontal rock strata. Photographed in Austria.
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