Rocky Mountain System – one branch of the Cordilleran system lying far inland in the western states.Interior Highlands – also part of the interior contentintal United States, this division includes the Ozark Plateau.Interior Plains – part of the interior contentintal United States, it includes much of what is called the Great Plains.Appalachian Highlands – lying on the eastern side of the United States, it includes the Appalachian Mountains, Adirondacks and New England province.Atlantic Plain – the coastal regions of the eastern and southern parts includes the continental shelf, the Atlantic Coast and the Gulf Coast.Laurentian Upland – part of the Canadian Shield that extends into the northern United States Great Lakes area.Within the continental U.S., eight distinct physiographic divisions exist, though each is composed of several smaller physiographic subdivisions. The geography of the United States varies across their immense area. Physiographic divisions of the United States Lush temperate, subtropical, and tropical vegetation and low to moderately high mountains prevail throughout the humid east, and high mountains, plateaus, temperate and subtropical savannas, and hot dry deserts prevail in the west. Cities of the United States, by populationĮnvironment of the United States An enlargeable satellite composite image of the contiguous United States.Area of the United States: 9,826,630 km 2 (3,794,080 sq mi) – 4th most extensive country. Population of the United States: 308,745,538 (2010 census) – 3rd most populous country.Hawaii-Aleutian Standard Time ( UTC-10), Hawaii-Aleutian Daylight Time ( UTC-09).Alaska Standard Time ( UTC-09), Alaska Daylight Time ( UTC-08).
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