Imnaha Basalt, Oregon

Imnaha Basalt, Oregon

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Credit: William H. Mullins/SCIENCE PHOTO LIBRARY

Caption: Imnaha basalts, one of the oldest of the Columbia River Basalt Group, Oregon. Basalt is an extrusive igneous rock, which means it forms from the cooling of lava on the surface. Contraction of the lava as it cools leads to the geometry of the columns, which have either hexagonal or pentagonal cross-sections.

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Keywords: basalt, basalt column, basalt flows, basalt layers, cliff, columbia river basalt, columbia river gorge, columnar, earth science, fallen rocks, geological, geology, hills, igneous, igneous formation, igneous rock, imnaha basalt, landscape, lava, lava flow, lava flows, north america, oregon, oregon geology, rock formation, rockfall, rocky, rocky hills, steep hills, usa

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