Central Lowland

Central Lowland

 

a plains region in the interior of North America, in the USA and Canada. The Central Lowland is bounded on the southeast and northeast by the Appalachian Mountains and the Laurentian Upland; in the west it adjoins the Great Plains, and it extends south to the Gulf Coastal Plain. The region has elevations of 150–500 m.

The Central Lowland corresponds to the southern North American Shield, whose crystalline basement is overlain by horizontal and slightly dipping strata of Paleozoic shales and limestones. It contains the coal deposits of the interior coalfields and deposits of petroleum and salt. The Ozark Plateaus have deposits of lead and zinc (at St. Joseph) and barite. The Central Lowland’s various plains include hilly-morainal, outwash, and lake plains in the north. Morainal and loess plains that are deeply dissected by valleys are found in the central part, and elevated plains with typical erosion relief and karst formations, such as the Ozark Plateaus, are found in the south. Cuestas, such as the Niagara Escarpment, are located in the north; the Boston Mountains are located in the south. Most of the Central Lowland is drained by the river system of the Mississippi River basin. In the north is a group of large lakes formed by glacial erosion, including the Great Lakes and Lakes Winnipeg, Winnipegosis, and Manitoba.

The region has a temperate continental climate that becomes subtropical in the extreme south. The mean January temperature ranges from –20°C in the north to 4°C in the south. During the winter, freezes and thaws alternate frequently, and heavy snowstorms occur. The mean July temperature ranges from 18°C in the north to 25°C in the south. Annual precipitation varies from 400 mm in the northwest to 1,200 mm in the southeast. In the north, brown forest soils predominate; on these soils grow mixed forests of black and white spruce, pine, sugar and red maple, linden, and common hemlock and broadleaved forests of white and red oak and hickory. Chernozem-like soils formed in the south under the tall-grass prairies, which have virtually disappeared owing to the plowing under and settlement of the area. In the north, some forested areas still remain in uplands inconvenient for economic development. The most common mammals are rodents.

The Central Lowland is one of the most important agricultural regions of the United States and Canada, producing grain and livestock. More than 75 percent of the region is pasture and cropland. The large metropolitan areas of Chicago, Detroit, and Cleveland are located in the northeastern Central Lowland.

A. V. ANTIPOVA

References in periodicals archive ?
of Oregon) describe a language that is spoken by about 3,100 people in the central lowland plains of Venezuela and is a member of the Venezuelan Carib language family.
Ozark Plateaus, Central Lowland, Interior Low Plateaus, Appalachian
Ben Cleuch, the largest of the Ochils at 721 metres (2,365 feet), isn't particularly exciting on its own, but it is the highest point in an isolated range whose views encompass huge swathes of the southern Highlands and the central Lowlands. From famous Bens to the glittering Forth, as it winds its way from agricultural land to industrial Grangemouth, it's a spectacular vantage point.
The town in the Central Lowlands had a demand percentage of 64 percent.
Ministry for Water Resources and Meteorology spokesman Chan Yutha said on Monday that highland areas and the central lowlands of the country will experience more heavy rains in the coming days.
It found the daily average winter rainfall was likely to increase by 10 per cent to 35 per cent in parts of the Scottish Central Lowlands and western Highlands but fall 10 per cent to 25 per cent around Aberdeen.
It found that daily average winter rainfall was likely to increase by 10%-35% in parts of the Scottish Central Lowlands, western Scottish Highlands and the Lake District, but fall 10%-25% around Aberdeen.
In Central Lowlands, including Mingachevir, Yevlakh, Goychay, Agdash, Kurdamir, Imishli, Agjabedi, Beylagan, Sabirabad, Bilasuvar, Saatli, Shirvan, Hajigabul, Salyan, Neftchala regions, average monthly temperature is expected to be +6+8C (+4+9C at nights, from -1 degrees of frost to +3 C on some days, +8+13C in the daytime, +16+20 C on some days) which is close to climate normal.
He points out the valley's strategic significance to all concerned as a principal supply route leading from the North Vietnamese "trunk lines" in off-limits Laos to the northern and central lowlands of South Vietnam.
The family's principal seat was at Alloa, beside the Firth of Forth in the Central Lowlands of Scotland.
Known as the central lowlands, the middle and western counties are dominated by glaciated plains, fertile soil, gently rolling hills and substantial agriculture.
The discoveries will help archaeologists study the cultural and political histories of an area known as the Central Lowlands of the Maya region, the National Institute for Anthropology and History said.

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