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Geography of The United States  

2010-07-10 09:48:24|  分类: profession |  标签: |举报 |字号 订阅

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The United States is located in North America, Central, territory includes North America, Alaska and the northwest Hawaiian Islands, the central Pacific. National land area of 9,629,091 square kilometers (National Bureau of Statistics, the National General Accounting Office), behind Russia and Canada. Its northern border with Canada, south through the Gulf of Mexico, the west Pacific Ocean, east Atlantic Ocean. Coastline of 22,680 kilometers. Most regions of the temperate continental climate, the southern subtropical climate, distributed in the eastern coastal temperate maritime climate and Mediterranean climate. North Central Plain (central Great Plains) a great difference in temperature in Chicago in January average temperature of -3 ℃, 7 Yue 24 ℃; the Gulf Coast in January average temperature of 11 ℃, 7 Yue 28 ℃. The lowest point of Death Valley National (Death Valley, -86 m), highest point Mount McKinley (Mount Mckinley, 6,198 m).
The United States had almost all the world's climate types (across cold, warm, hot three zones, the local community in the temperate zone), in the main agricultural areas rarely severe droughts, floods and flooding is not common, and has a mild and can adequate rainfall, temperatures.
Affect the U.S. climate is mainly arctic air, brought from the Pacific each year a large-scale low pressure, these low pressure through the Sierra Nevada, Rocky Mountains, and the Cascade Mountain Range, when a large number of entrained moisture, air pressure when they reach the central When the Great Plains will be able to reorganize, leading to the main air masses encounter brought intense thunderstorms, especially in the spring and summer. Sometimes these rainstorms may be joined with other low pressure, to continue to the East Coast and the Atlantic Ocean, and will become more intense storms in the Northeast (Nor'easter), in the United States Northeast New England Mid-Atlantic region and the formation of a broad and heavy snowfall. Great Plains, with vast grasslands has also developed many of the world's most extreme climate change phenomena.
Great Basin region and the high principles of the Columbia River in arid areas with little rainfall, the most drought the average annual rainfall is less than 15 inches (38 cm). The southwestern United States is arid desert, the hottest summer temperature of a few weeks more than 100 degrees Fahrenheit (38 degrees Celsius). Southwest and the Great Basin region will also be the monsoon from the Gulf of California, and occasionally heavy rain will bring rare. Most of the region belong to the California Mediterranean climate, sometimes every year in October until the following year in April triggered a strong rainstorm, while the rest of the year with virtually no rainfall. The brink of the Pacific north-west region while heavy rain continued throughout the year, but the maximum rainfall in the winter and spring. Western Mountains absorbed sufficient moisture, rainfall and snowfall are quite heavy. Cascade Range is the world's one of the most snowfall, but few low-lying coastal areas of snow.
In general can be divided into three major river systems: Where is located east of the Rocky Mountain rivers into the Atlantic Ocean known as the Atlantic water system, mainly the Mississippi River, Connecticut River and the Hudson River. Length of 6020 kilometers of which the Mississippi River, ranking fourth in the world. Where the Pacific Ocean into the Pacific Ocean, said the river water. Mainly the Colorado River, Columbia River, the Yukon River. Groups in the eastern part of the Great Lakes in North America - Great Lakes. Including Lake Superior, Lake Michigan, Lake Huron, Lake Erie and Lake Ontario, is a glacial lake, with a total area of 24.5 square kilometers, the world's largest fresh water, known as "North America, the Mediterranean," said, in which Lake Michigan is the United States and the remaining four lakes for the United States and Canada. Lake Superior is the world's largest freshwater lake, an area of lakes in the world after the Caspian door to second in the world. Import the St. Lawrence River Great Lakes water flows into the Atlantic Ocean.

生物

In general can be divided into three major river systems: Where is located east of the Rocky Mountain rivers into the Atlantic Ocean known as the Atlantic water system, mainly the Mississippi River, Connecticut River and the Hudson River. Length of 6020 kilometers of which the Mississippi River, ranking fourth in the world. Where the Pacific Ocean into the Pacific Ocean, said the river water. Mainly the Colorado River, Columbia River, the Yukon River. Groups in the eastern part of the Great Lakes in North America - Great Lakes. Including Lake Superior, Lake Michigan, Lake Huron, Lake Erie and Lake Ontario, is a glacial lake, with a total area of 24.5 square kilometers, the world's largest fresh water, known as "North America, the Mediterranean," said, in which Lake Michigan is the United States and the remaining four lakes for the United States and Canada. Lake Superior is the world's largest freshwater lake, an area of lakes in the world after the Caspian door to second in the world. Import the St. Lawrence River Great Lakes water flows into the Atlantic Ocean.

自然资源丰富natural resources

Rich in natural resources. Coal, oil, natural gas, iron ore, potash, phosphate, sulfur and other mineral reserves, ranking in the world. Strategic mineral resources of titanium, manganese, cobalt, chromium and other major imported. Proved reserves of 35,966 million tons of coal. Proven crude oil reserves of 270 billion barrels. 56,034 billion cubic meters of proven natural gas reserves. The forest area of about 44 million mu, the coverage rate of up to 33%.

行政区划administrative divisions

U.S. first-level administrative divisions of the state, rightly, the state is not a country consists of zoning, but by a coalition of these states, because the U.S. is a federal system, like other federal countries, the SAR has a great sovereignty. According to a number of U.S. Supreme Court ruled that states and federal government are judicial sovereignty, but the federal government bound by the United States Constitution, while the states there are considerable judicial sovereignty, but only if not contrary to two principles: first, of its sovereignty can not override the federal government and the United States Constitution; II, and its own set of constitutional competences between the state can not exceed the overall national sovereignty.
The states are divided into administrative divisions more immediate and local state-owned, but there are three divisions in the hierarchy there are two divisions. Directly under the state institutions such as the Bureau of Statistics, supervision and reach of public health units, local government, compared with the county, representing part of the country's counties, usually consists of different levels in the county zoning, the most common in the Midwest is the township is located.
In some states, such as Michigan, which has some autonomous powers of the State University, State University of autonomy is sometimes exaggerated, and his position in the executive and the legislative equivalent of a county, and even exceeded.
In some states, cities independent of the township, and sometimes independent of the county, such as Virginia, all of the city. City is a semi-autonomous body, its essence similar to the ancient city-state structure, but now there is only city-state of Monaco, San Marino, Singapore, and the Vatican.
Today, the United States is divided into 10 regions, 50 states and one directly under the Special Administrative Region, a total of 3042 counties or county (county, a county in Louisiana for the parish):
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