Interior Plains

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Interior Plains


a plains region in the central part of South America, from 10° to 39° S lat. It includes the natural areas the Mamoré Plains, the Pantano, Gran Chaco, and Entre Rios plains, and the Pampas. The region is basically made up of aggradation plains (with elevations of 50-70 m in the east to 500-600 m in the west), on the site of the tectonic trough between the Brazilian Highlands in the east, the Andes and the Pampas Sierras in the west, and Patagonia in the south. The plains are composed chiefly of a thick stratum of Cenozoic continental sediments characterized primarily by fluvial genesis in their upper portion. In the south loess is widely found. The plain is interrupted only by ancient folded-block mountains located between 18° and 20° S lat. (up to 1,425 m) and in the southern Pampas (up to 1,243 m). There is a characteristic sequential shift of regional landscapes from the subequatorial savanna forests and savannas in the north, through the tropical sparse forests in the center, to the subtropical savannas, prairies, and steppes in the south. Along the Paraguay and Paraná rivers there is a belt of marshy forests.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
As for now, Hamilton has his heart set on a winter holiday surrounded by mountains in Colorado (the eastern edge of the Rockies rises dramatically above the Interior Plains of central North America) and catching up on the popular TV series Game of Thrones.
The NSW interior plains turned into places of ecological and environmental injustice, leaving people unable to participate in large-scale irrigation agriculture with the remnants of an already overstrained land, and often having to migrate.
The Cordilleran region in the west basin is mountainous, the central Interior Plains are relatively flat, and the eastern region in the Canadian Shield has undulating topography (Fig.
Headwater rivers that represent different flow regimes include the Upper Liard and Peel (nival), the Athabasca at Jasper (proglacial), the Hay (wetlands and lakes of Interior Plains), the Clearwater (combination of Canadian Shield and Interior Plains), the Great Bear (prolacustrine), and the Peace at Hudson Hope (regulated).
They include CV = 38% for the Peace River at Hudson Hope, which receives irregular releases from the reservoir above the station, and an exceptionally large CV of 79% for the minimum discharge of the Hay River, which drains wetlands and lakes on the Interior Plains that are subjected to the vagaries of summer rain and evaporation depending on the direction of regional air flow over the Mackenzie Basin (Szeto et al., 2008).
For example, the border separating the United States and Canada intersects nine major ecological regions, including Arctic tundra, many forest types, several mountain ranges, two coastal plains, the vast interior plains, and the Great Lakes.

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