BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Banding patterns in a wall of igneous rock. These bands were formed when molten material was forced at high pressure into cracks in the crystalline base rock. The molten rock later formed granite. The resulting black and white pattern is known as gneiss. Photographed at the Gunnison National Monument, Colorado, USA.
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