Polygonal Ground | Article about Polygonal Ground by The Free Dictionary
polygonal ground[pə′lig·ən·əl ′grau̇nd]
A ground surface consisting of polygonal arrangements of rock, soil, and vegetation formed on a level or gently sloping surface by frost action. Also known as cellular soil.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a form of microrelief and mesorelief in regions with seasonally and permanently frozen rocks. Polygonal ground is produced by frost and desiccation cracks that form a network of rectangles or polygons with five or six sides. Frost-crack polygons with convex or concave surfaces—the latter are surrounded by ridges—may reach several hundred m in diameter and are separated from one another by cracks, which are frequently filled with ice wedges. Stone polygons and other smaller polygons are surrounded by elevated walls made of large gravel fragments. Desiccation-crack polygons range in diameter from a few cm to 3 m.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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