File:Basalt columns in yellowstone 2.jpg
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Summary
| 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 | |
| Source | Own work |
| Author | Brocken Inaglory |
| Camera location |  | View this and other nearby images on: OpenStreetMap |  |
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:12, 24 January 2013 | | 3,072 × 2,592 (8.22 MB) | Slick-o-bot | Bot: convert to a non-interlaced jpeg (see bug #17645) |
| 01:03, 29 March 2009 |  | 3,072 × 2,592 (7.28 MB) | Mbz1 | Improved resolution and quality | |
| 03:05, 6 July 2008 |  | 2,100 × 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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