ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ

ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ  БЮДЖЕТНОЕ  ОБРАЗОВАТЕЛЬНОЕ УЧРЕЖДЕНИЕ ВЫСШЕГО ПРОФЕССИОНАЛЬНОГО ОБРАЗОВАНИЯ

РОССИЙСКАЯ ГОСУДАРСТВЕННАЯ  АКАДЕМИЯ ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ

(РГАИС)

Кафедра: «Русского  и иностранных языков»

 

 

 

Реферат на тему:

  «Geographical position of the USA»»

 

 

 

                                                            Выполнил:

 

 

Москва – 2012 г.

Contents1

Introduction……………………………………………………..3

2 General characteristics…………………………………5

3 Physiographic divisions………………………………………………6

4 Climate……………………………………………….12

5 Natural disasters……………………………………...16

6 Clossing part………………………………………….18

 
1.Introduction

 

The USA occupies the central part of the North American continent. It borders on Canada in the north and Mexico in the south. It is washed by the Atlantic Ocean in the east, by the Pacific Ocean in the west and by the Gulf of Mexico in the south.

The present territory of the USA consists of three separate parts. The USA proper and Alaska are situated in North America. The Hawaii are situated in the central part of the Pacific Ocean.

The area of the country is about 9,400,000 km2. Its population is about 256 million people.

No general statement can be made about the landscape of the USA. It is a country of mountains and prairies, valleys and deserts. About one half of the territory in the west is occupied by the Cordilleras. In the east there are the Appalachian Mountains. Between these great mountain chains central and large valleys lie.

The Rocky Mountains extend from Alaska through Canada and the USA to Mexico. Together with the Sierra Nevada Mountains in California they have snow-capped peaks and clear mountain lakes.

The Great Lakes are situated in the north-east of the country. They are Lake Ontario, Lake Huron, Lake Erie, Lake Superior, Lake Michigan. The largest rivers of the USA are the Mississippi, the Missouri, the Columbia, the Colorado, and the Yukon. American rivers have very expressive names: the Snake River, the Milk River, the Green River, the Sweetwater River, the White River.

The USA has rich deposits of coal, oil, iron, zinc, copper, silver, phosphate rock, natural gas, uranium and nonferrous metals. The country has one fourth of the world’s coal deposits.

2. General characteristics

 

The United States shares land borders with Canada (to the north) and Mexico (to the south), and a territorial water border with Russia in the northwest. The contiguous forty-eight states are otherwise bounded by the Pacific Ocean on the west, the Atlantic Ocean on the east, and the Gulf of Mexico to the southeast. Alaska borders the Pacific Ocean to the south, the Bering Strait to the west, and the Arctic Ocean to the north, while Hawaii lies far to the southwest of the mainland in the Pacific Ocean.

Forty-eight of the states are in the single region between Canada and Mexico; this group is referred to, with varying precision and formality, as the continental or contiguous United States, and as the Lower 48. Alaska, which is not included in the term contiguous United States, is at the northwestern end of North America, separated from the Lower 48 by Canada. The State of Hawaii is an archipelago in the Pacific Ocean. The capital city, Washington, District of Columbia, is a federal district located on land donated by the state of Maryland. (Virginia had also donated land, but it was returned in 1847.) The United States also has overseas territories with varying levels of independence and organization.

The continental United States contains two harbor indented coasts of several thousand miles from which well watered coastal plains rise to two mountain ranges between which is an arable plain overlaid by thousands of miles of interconnected and navigable rivers. The Texas continental crossroads, the southerly deserts, and the basin and range country of Utah and Nevada complete the picture. The combination of rivers navigable thousands of miles inland, running throughout virtually all of the largest contiguous area of farm land in the world, has helped to make the United States the world's breadbasket and wealthiest nation by far. Considering both the natural features and the political unity of the states of the region of the Great Plains, contrasted with the river systems and political disunity of Europe as an example, nothing quite like it exists anywhere else in the world. New Orleans--purchased along with the French territory of Louisiana in 1803--is the key to the Mississippi, Missouri, Ohio, Arkansas, Tennessee, and Red river system of North America. In turn, Texas, with its own, unnavigable rivers, but productive land, acts as a buffer to protect New Orleans from the south and west.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. Physiographic divisions

 

The eastern United States has a varied topography. A broad, flat coastal plain lines the Atlantic and Gulf shores from the Texas-Mexico border to New York City, and includes the Florida peninsula. Areas further inland feature rolling hills and temperate forests. The Appalachian Mountains form a line of low mountains separating the eastern seaboard from the Great Lakes and the Mississippi Basin. The five Great Lakes are located in the north-central portion of the country, four of them forming part of the border with Canada. The southeast United States contain subtropical forests and, near the gulf coast, mangrove wetlands, especially in Florida. West of the Appalachians lies the Mississippi River basin and two large eastern tributaries, the Ohio River and the Tennessee River. The Ohio and Tennessee Valleys and the Midwest consist largely of rolling hills and productive farmland, stretching south to the Gulf Coast.

The Great Plains lie west of the Mississippi River and east of the Rocky Mountains. A large portion of the country's agricultural products are grown in the Great Plains. Before their general conversion to farmland, the Great Plains were noted for their extensive grasslands, from tallgrass prairie in the eastern plains to shortgrass steppe in the western High Plains. Elevation rises gradually from less than a few hundred feet near the Mississippi River to more than a mile high in the High Plains. The generally low relief of the plains is broken in several places, most notably in the Ozark and Ouachita Mountains, which form the U.S. Interior Highlands, the only major mountainous region between the Rocky Mountains and the Appalachian Mountains. The Great Plains come to an abrupt end at the Rocky Mountains. The Rocky Mountains form a large portion of the Western U.S., entering from Canada and stretching nearly to Mexico. The Rocky Mountain region is the highest region of the United States by average elevation. The Rocky Mountains generally contain fairly mild slopes and wider peaks compared to some of the other great mountain ranges, with a few exceptions (such as the Teton Mountains in Wyoming and the Sawatch Range in Colorado). The highest peaks of the Rockies are found in Colorado, the tallest peak being Mount Elbert at 14,440 ft (4,400 m). The Rocky Mountains contain some of the most spectacular, and well known scenery in the world. In addition, instead of being one generally continuous and solid mountain range, it is broken up into a number of smaller, intermittent mountain ranges, forming a large series of basins and valleys.

West of the Rocky Mountains lies the Intermontane Plateaus (also known as the Intermountain West), a large, arid desert lying between the Rockies and the Cascades and Sierra Nevada ranges. The large southern portion, known as the Great Basin, consists of salt flats, drainage basins, and many small north-south mountain ranges. The Southwest is predominantly a low-lying desert region. A portion known as theColorado Plateau, centered around the Four Corners region, is considered to have some of the most spectacular scenery in the world. It is accentuated in such national parks as Grand Canyon, Arches, Mesa Verde National Park and Bryce Canyon, among others.

The Grand Canyon from Moran Point. The Grand Canyon is among the most famous locations in the country.

The Intermontane Plateaus come to an end at the Cascade Range and the Sierra Nevada. The Cascades consist of largely intermittent, volcanic mountains, many rising prominently from the surrounding landscape. The Sierra Nevada, further south, is a high, rugged, and dense mountain range. It contains the highest point in the contiguous 48 states, Mount Whitney(14,505 ft/4,421 m). Mount Whitney is the highest summit in the contiguous United States with an elevation of 14,505 feet (4,421 m).[1] It is located at the boundary between California's Inyo and Tulare counties, just 84.6 miles (136.2 km) west-northwest of the lowest point in North America at Badwater in Death Valley National Park (282 feet (86 m) below sea level).These areas contain some spectacular scenery as well, as evidenced by such national parks as Yosemite and Mount Rainier. West of the Cascades and Sierra Nevada is a series of valleys, such as the Central Valley in California and the Willamette Valley in Oregon. Along the coast is a series of low mountain ranges known as the Pacific Coast Ranges. Much of the Pacific Northwest coast is inhabited by some of the densest vegetation outside of the Tropics, and also the tallest trees in the world (the Redwoods).

The Big Sur coastline in Central California provides some of the most spectacular scenery along the Pacific Coast Range.

Alaska contains some of the most dramatic and untapped scenery in the country. Tall, prominent mountain ranges rise up sharply from broad, flat tundra plains. On the islands off the south and southwest coast are many volcanoes. Hawaii, far to the south of Alaska in the Pacific Ocean, is a chain of tropical, volcanic islands, popular as a tourist destination for many from East Asia and the mainland United States.

The geography of the United States varies across their immense area. Within the continental U.S.,eight distinct physiographic divisions exist, though each is composed of several smaller physiographic subdivisions. These major divisions are:

Laurentian Upland - part of the Canadian Shield that extends into the northern United StatesGreat Lakes area.

Atlantic Plain - the coastal regions of the eastern and southern parts includes the continental shelf, the Atlantic Coast and the Gulf Coast.

Appalachian Highlands - lying on the eastern side of the United States, it includes theAppalachian Mountains, the Watchung Mountains, the Adirondacks and New England province originally containing the Great Eastern Forest.

Interior Plains - part of the interior contentintal United States, it includes much of what is called the Great Plains.

Interior Highlands - also part of the interior contentintal United States, this division includes the Ozark Plateau.

Rocky Mountain System - one branch of the Cordilleran system lying far inland in the western states.

Intermontane Plateaus - also divided into the Columbia Plateau, the Colorado Plateau and the Basin and Range Province, it is a system of plateaus, basins, ranges and gorges between the Rocky and Pacific Mountain Systems. It is the setting for the Grand Canyon, the Great Basin and Death Valley.

Pacific Mountain System - the coastal mountain ranges and features in the west coast of the United States.

Delicate Arch, Arches National Park, Utah

The Atlantic coast of the United States is, with minor exceptions, low. The Appalachian Highland owes its oblique northeast-southwest trend to crustal deformations which in very early geological time gave a beginning to what later came to be the Appalachian mountain system. This system had its climax of deformation so long ago (probably in Permian time) that it has since then been very generally reduced to moderate or low relief. It owes its present day altitude either to renewed elevations along the earlier lines or to the survival of the most resistant rocks as residual mountains. The oblique trend of this coast would be even more pronounced but for a comparatively modern crustal movement, causing a depression in the northeast resulting in an encroachment of the sea upon the land. Additionally, the southeastern section has undergone an elevation resulting in the advance of the land upon the sea.

A physiographical map, of the contiguous 48 states of the U.S. The map indicates the age of the exposed surface as well as the type of terrain.

While the Atlantic coast is relatively low, the Pacific coast is, with few exceptions, hilly or mountainous. This coast has been defined chiefly by geologically recent crustal deformations, and hence still preserves a greater relief than that of the Atlantic. The low Atlantic coast and the hilly or mountainous Pacific coast foreshadow the leading features in the distribution of mountains within the United States. The east coast Appalachian system, originally forest covered, is relatively low and narrow and is bordered on the southeast and south by an important coastal plain. TheCordilleran system on the western side of the continent is lofty, broad and complicated having two branches, the Rocky Mountain System and the Pacific Mountain System. In between these mountain systems lie the Intermontaine Plateaus. Both the Columbia River and Colorado River rise far inland near the easternmost members of the Cordilleran system, and flow through plateaus and intermontaine basins to the ocean. Heavy forests cover the northwest coast, but elsewhere trees are found only on the higher ranges below the Alpine region. The intermontane valleys, plateaus and basins range from treeless to desert with the most arid region being in the southwest.

The Laurentian Highlands, the Interior Plains and the Interior Highlands lie between the two coasts, stretching from the Gulf of Mexico northward, far beyond the national boundary, to the Arctic Ocean. The central plains are divided by a hardly perceptible height of land into aCanadian and a United States portion. It is from the United States side, that the great Mississippi system discharges southward to the Gulf of Mexico. The upper Mississippi and some of the Ohio basin is the semi-arid prairie region, with trees originally only along the watercourses. The uplands towards the Appalachians were included in the great eastern forested area, while the western part of the plains has so dry a climate that its native plant life is scanty, and in the south it is practically barren.

Elevation extremes:

Lowest point: Death Valley, Inyo County, California −282 ft (−86 m) below sea level

Highest point: Mount McKinley, Denali Borough, Alaska +20,320 ft (6,194 m) above sea level

 

4. Climate

 

Due to its large size and wide range of geographic features, the United States contains examples of nearly every global climate. The climate is temperate in most areas, subtropical in the Deep South, tropical in Hawaii and southern Florida, polar in Alaska, semiarid in the Great Plains west of the100th meridian, Mediterranean in coastal California and arid in the Great Basin. Its comparatively favorable agricultural climate contributed (in part) to the country's rise as a world power, with infrequent severe drought in the major agricultural regions, a general lack of widespread flooding, and a mainly temperate climate that receives adequate precipitation.

Deep snow during the Blizzard of 2006 Nor'easter in Brooklyn, New York City.

The main influence on U.S. weather is the polar jet stream, which brings in large low pressure systems from the northern Pacific Ocean. The Cascade Range, Sierra Nevada, and Rocky Mountains pick up most of the moisture from these systems as they move eastward. Greatly diminished by the time they reach the High Plains, much of the moisture has been sapped by theorographic effect as it is forced over several mountain ranges. However, once it moves over the Great Plains, uninterrupted flat land allows it to reorganize and can lead to major clashes of air masses. In addition, moisture from the Gulf of Mexico is often drawn northward. When combined with a powerful jet stream, this can lead to violent thunderstorms, especially during spring and summer. Sometimes during late winter and spring these storms can combine with another low pressure system as they move up the East Coast and into the Atlantic Ocean, where they intensify rapidly. These storms are known as Nor'easters and often bring widespread, heavy snowfall to the Mid-Atlantic and New England. The uninterrupted flat grasslands of the Great Plains also leads to some of the most extreme climate swings in the world. Temperatures can rise or drop rapidly and winds can be extreme, and the flow of heat waves or Arctic air masses often advance uninterrupted through the plains.

The U.S. State of Hawaii has a year-round tropical climate, and is known for its many beaches, such as Waikiki Beach on O'ahu.

The Great Basin and Columbia Plateau (the Intermontane Plateaus) are arid or semiarid regions that lie in the rain shadow of the Cascades and Sierra Nevada. Precipitation averages less than 15 inches (38 cm). The Southwest is a hot desert, with temperatures exceeding 100 °F (37.8 °C) for several weeks at a time in summer. The Southwest and the Great Basin are also affected by the monsoon from the Gulf of California from July–September, which brings localized but often severe thunderstorms to the region.