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[Stockbild] Sedimentary rock. Aerial photograph of sandstone showing cross-bedding. This sedimentary rock was formed by the deposition of successive layers of sediment carried in water or air currents, later compressed into rock. The cross-bedding (narrow lines) are produced by changes in the direction of the depository water over time. Photographed in the Paria Wilderness, Utah, USA. (KEYSTONE/SCIENCE PHOTO LIBRARY/BERNHARD EDMAIER) === ===