MICHAEL MARTEN / SCIENCE PHOTO LIBRARY MICHAEL MARTEN / SCIENCE PHOTO LIBRARY
Sandstone rock strata. Layers (strata) in coastal sandstone. Sandstone rock is a sedimentary rock, and forms by the deposition of successive layers of water-borne sediment that are later compressed into rock. Changes in sea level and movement of the Earth's crust can raise the rock to where the strata can be revealed by erosion. Photographed in Northumberland, UK.
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