The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
cirque-shaped depressions on the steep slopes of valleys and ravines. They form as a result of the surface displacement of masses of loam abundantly moistened by ground and surface waters, especially during the slow thawing of snow on shady slopes.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.