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File:Basalt columns in yellowstone 2.jpg


Description Basalt columns in Yellowstone National Park.During the cooling of a thick lava flow, contractional joints or fractures form. If a flow cools relatively rapidly, significant w:contraction forces build up. While a flow can shrink in the vertical dimension without fracturing, it cannot easily accommodate shrinking in the horizontal direction unless cracks form; the extensive fracture network that develops results in the formation of columns.
Date 23 June 2008
Source Own work
Author Brocken Inaglory

Camera location

44° 53′ 49.60″ N, 110° 23′ 21.71″ W

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