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Occupies almost half of the continent the country has a huge range of climatic conditions. In the US, you can find out how hot arid deserts and wet evergreen forests as the harsh mountain landscapes and vast expanses of grassy plains and dense forests. For these reasons, the country is usually divided into eight natural provinces united for the sake of simplicity in four zones: the mountainous areas of the Cordillera, Central Plains, the Appalachian mountains and coastal plains, separating Alaska and Hawaii in some natural systems. About half of US territory is occupied by mountain ranges, highlands and plateaus of the Cordillera vast, stretching from north to south across the west of the country, from Alaska to California and New Mexico. The length of the mountain range of about 1,700 km with a maximum width of up to 1,600 km (nearly one-third of the United States, the rest - the Appalachian Mountains and other old, often weathered to a state of high hills or plateau). In a complex system of ridges and intermountain basins of the Cordillera quite clearly divided into three zones - Eastern, or belt of the Rocky Mountains (the mountains of Sacramento, Sangre de Cristo, Front Range, Big Horn and others, the highest point - Mount Elbert, 4399 m); Western, or Pacific belt (Coast Mountains, the Sierra Nevada, the Cascade Mountains, Baja California, etc., the highest point - Mount Whitney, 4418 meters) and the so-called inner belt, which consists of high plateaus (Colorado, Utah, and others.) and individual mountain ranges separated by deep basins ("Park") and valleys (where is the lowest point of the continent - Death Valley - 85 m). ET circumscription of the Rocky Mountains in the southern part of the Coast Ranges (San Andreas Fault) there is a high seismic activity, and in the Cascade Mountains have active and dormant volcanoes (Mount Rainier, Hood, Olympus, etc.). The nature of mountain areas are extremely diverse - on the eastern and the northern slopes are abundant in the dense mixed forests and lots of grassy prairie, higher slopes stretch mountain forests, alpine meadows and heathland, mountain peaks crowned by powerful glaciers and snowfields (total area of glaciation about 67 thousand. sq. km), and in the intermountain basins dry vegetation, close to the Mediterranean type. In the southern regions of the Intermountain found vast areas of rocky desert and semi-desert (Sonora, Arizona, Mojave Desert Great Salt Lake, and others.), Vast salt marshes, and in the north - the evergreen montane forests. From the slopes of the mountains originate sources of many rivers - Ampkua, Arkansas, Klamath, Colorado, Columbia, Missouri, Platte, Rio Grande, Cheyenne and other (mountain areas are a natural watershed between the Atlantic and Pacific oceans), and in the inner belt in abundance there are stagnant areas (Great Basin, Depression Salton, the Great Salt Lake Desert, etc.) with the dry lake, covered with a thick crust of salt. Central Plains occupy an area of more than 2.9 million square feet. km stretch through the entire central part of the USA from north to south. Relief surface is elevated plains, with lots of hilly areas and extensive river valleys. However, this region is not as homogeneous as it seems - the west tower arrays Plateau Prairie, Missouri, Llano Estacado and Edwards (altitude 700-1800 m, width - 800 km) and in the east - the famous Great Plains with extensive prairies and agricultural areas in the center and north, and at least the vast semi-desert wastelands and erosion "bedlendz" in the southern part. To the east stretches the band Internal elevations (Plateau Ozark, Springfield and Salem, and low mountains Boston and Washita), and another to the east - the fertile Central Valley, passing in the north moraine plains around Lakes Ontario, Erie, Huron and Michigan. The east coast of the country frames the old system of the Appalachian Mountains, stretching from north-east to south-west for 2600 km (the highest point - Mount Mitchell in the mountains Black Mountains, 2037 m). The system of the Appalachians and heterogeneous: the main array is formed by two plateaus - the Allegheny Mountains to the north and Cumberland in the south, from the east limited the Piedmont Plateau and the mountain system of the Blue Ridge, the north - the mountains of the Adirondacks (highest point - Mount Marcy, 1629 m) and the hills of New England (White Mountains and Green Mountains) and to the west - Great Appalachian Valley (Great Valley) and area of numerous small ridges and river valleys of the left tributaries of the Mississippi. This mountain range is one of the oldest on the planet, so many slopes are heavily smoothed by erosion and densely overgrown with deciduous and coniferous forests and numerous rivers form a complex network of fertile valleys. From the east and south of the area Appalachian surrounded by a coastal plain, which stretches wide strip around the Atlantic coast the United States until the Mexican border in the south. The relatively narrow (160 to 320 km) Atlantic Coastal Plain, which lies between the eastern slopes of the Appalachians and the ocean, almost its entire length dissected valleys of numerous rivers. Here are the country's largest cities and many rural areas. Primeksikanskaya plain is much wider (up to 970 km, and its northern part juts into the mainland of the Mississippi Valley almost to Lake Michigan, forming part of the Central Valley). It is also dotted with numerous river valleys, and its southern part is a long strip of countless mouths and estuaries, the largest of which is the huge delta of the Mississippi. In the south-eastern part of the region deep in the sea shall be issued low-lying Florida peninsula, Posts
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