ADAM JONES / SCIENCE PHOTO LIBRARY ADAM JONES / SCIENCE PHOTO LIBRARY
Rock pattern. Pattern of lines exposed on the smooth sides of hills made of sedimentary sandstone known as slickrock. The different colours are due to the presence of different types of rock. Sedimentary rock is created by the deposition of granular material at the bottom of seas or lakes. As the deposition continues, the lower layers of material become compressed into rocks. Although sedimentary rock is deposited in horizontal layers, stresses within the Earth's crust often twist the rock to different angles. The rock face has been worn smooth by glacier erosion. Photographed in the Paria Wilderness Area, Arizona, USA.
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