DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Weathered sandstone. At low tide a ridge of weathered sandstone is exposed. It can be seen that the sandstone is comprised of layers which project at an angle. Sandstone is a type of sedimentary rock comprised of sand particles. These were deposited as sediment and then compacted and cemented together as more sand settled upon them. When it is underground the rock is subjected to stresses which can bend or buckle it, leading to non-horizontal layering (as here). It can occur in brown, red, yellow, green, grey and white varieties. The colour is determined by the exact composition of minerals. Photographed in British Columbia, Canada.
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