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File:Basalt columns in yellowstone 2.jpg

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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.

Source Own work
Author Brocken Inaglory
Camera location44° 53′ 49.6″ N, 110° 23′ 21.71″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMap - Google Earthinfo


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current11:12, 24 January 2013Thumbnail for version as of 11:12, 24 January 20133,072 × 2,592 (8.22 MB)Slick-o-botBot: convert to a non-interlaced jpeg (see bug #17645)
01:03, 29 March 2009Thumbnail for version as of 01:03, 29 March 20093,072 × 2,592 (7.28 MB)Mbz1Improved resolution and quality
03:05, 6 July 2008Thumbnail for version as of 03:05, 6 July 20082,100 × 1,395 (2.8 MB)Mbz1{{Information |Description={{en|1=b}} |Source=Own work by uploader |Author=Mbz1 |Date= |Permission= |other_versions= }} {{ImageUpload|full}}
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