Devil's Postpile National Monument. The flattened tops of polygonal basalt columns are seen here. Basalt is an igneous rock formed when lava cools in
Devil's Postpile National Monument. The flattened tops of polygonal basalt columns are seen here. Basalt is an igneous rock formed when lava cools in the air. It forms pentagonal or hexagonal prisms when it cools. The tops of the columns have been smoothed by glacial action. Photographed near Mammoth, California, USA.
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Photo credit: © GEORGE POST/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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Keywords: america, american, basalt, california, devils, eroded, erosion, geographical, geography, geological, geology, glacial, glaciology, igneous, mammoth, mineral, monument, national, north, postpile, rock, scenery, states, united, usa, volcanic
