Who can tell us more about the geography and climate of America?

The United States covers an area of 9,363,400 square kilometers, ranking fourth in the world after the Soviet Union, Canada and China.

The land of the United States (except Appalachian Mountains) can be divided into seven main regions: (1) Cheshire Mountains in Apara, (2) coastal lowlands, (3) central plains, (4) Ausak Mountains, (5) Rocky Mountains, (6) western grasslands and basins, and (7) Pacific coastal lowlands.

Cheshire in Apara

From the northeast to the southwest of the United States, it has been extended to Georgia and Alabama. This area can be subdivided into three parallel banded areas. From east to west, there are ① blue ridge area, ② ridge valley area and ③ Appalachian grassland area. Blue Ridge is a pleasant tourist area with cool summer, sparkling rivers and beautiful natural scenery. The river runs through the mountains, forming a steep and lush valley. Ridges and valleys are located in the west of Blue Ridge. It consists of a series of valleys from new york to Tennessee. The bottom of the valley is quite flat. Rich farms and prosperous cities, such as Albany and KenKnoxville, are located in the valley. Appalachian grassland is located in the west of ridge and ridge valley. The valley is a good arable land peacefully. There are abundant coal mines and oil under the grassland. Many large industrial centers in the United States, such as Pittsburgh, are located in this area.

Coastal lowlands

Coastal lowlands can be divided into three areas: ① Atlantic coastal plain, ② piedmont plateau and ③ Gulf plain. The Atlantic coastal plain extends from New England to the southern corner of Florida. Agriculture has always been very important in Virginia. In New Glen, which lacks arable land, people turn to the sea for fishing or sailing. There are many excellent ports in the Atlantic coastal bay. Baltimore, Boston, new york City, Norfolk and Philadelphia. They are all prosperous cities in the Gulf region. The piedmont plateau is an irregular plateau in the interior of the downhill line. The downhill line is the intersection of the piedmont plateau and the Atlantic coastal plain. This hilly plateau stretches from New England to central Alabama, where tobacco, apples or cows are produced. The Gulf of Mexico at the southern tip of Florida is a coastal plain. The flat plains of this land are distributed from temperate zone to tropical zone, which can produce rice and subtropical fruits. Its north is adjacent to the cotton belt of the United States. The two most important rivers in the coastal plain are Mississippi River and Oregon River. The Mississippi River and its main tributary, the Missouri River, constitute one of the largest water systems in the world. It irrigates most inland plains and some bay plains.

Central plain area

This area extends from the Appalachian highlands to the Rocky Mountains. The western part of the inland plain is the so-called "grassland" area. Many of the most productive farms and largest factories in the world are located in inland plains. In the development of inland plains, the Great Lakes are as important as the Mississippi River. These five lakes-Lake Erie, Lake Huron, Lake Michigan, Lake Ontario and Lake Superior-are the largest freshwater lakes in the world. 780 square kilometers. Industry and commerce in Buffalo, Chicago, Cleveland, Detroit, Toronto and Milwaukee are closely related to the Great Lakes.

Oshak mountains

This area stands high above the inland plain. This area is famous for its vast beauty and is a popular holiday resort. There are many rapids, clean streams and underground caves here. These mountains are covered with dense forests and contain coal, iron and other minerals. The soil outside the valley area is too barren to cultivate.

Rocky Mountains

The Rocky Mountains extend from northern New Mexico through Canada to Alaska. This tall and continuous mountain range forms the backbone of the North American continent, and the great watershed runs through the Rocky Mountains. This is the watershed between the Pacific Ocean and the Atlantic Ocean.

Grassland and basin areas in western China

These areas are located in the west of the Rocky Mountains. The Colorado River cuts the grassland into deep canyons. Rugged terrain and bright colors make it one of the natural wonders of the world. Great basin, located between the basin and the hills, is a desert area.

Pacific coastal lowlands

Sierra Nevada and Castel are isomorphic with the eastern boundary of the cost area. Columbus Valley is the only accessible route in this area surrounded by gables. There are vast forests and rich minerals in the mountains, especially gold mines. The western Sierra Nevada and Cascade Mountains are a series of fertile valleys, in which many major cities in the western United States are located. The coastal hills are on the west side of the above valley. These mountains slide directly into the Pacific Ocean in many places, but the principle of coastal leveling around Los Angeles is quite broad. The Pacific Ocean is different from the Atlantic coast because there are few bays along the Pacific coast.

climate

There are many different types of climate in America. Some areas are very hot, while others are very cold. There is too much rain in some areas and not enough rain in others. However, the mild climate in most areas has promoted the rapid development of national industries and improved the economic growth of American agriculture. Arizona, southern California, Florida and Hawaii, because of the mild winter climate, tourism is booming. Precipitation (such as rain, snowmelt, frost and hail) is evenly distributed in the United States. The average annual rainfall in Nevada, which is relatively dry in most parts of the west, is 188? 5 mm, but the average annual rainfall in the wettest Louisiana is 1432 1 mm. The wettest place in America is Mount Wailira on the island of Hawaii. The average annual rainfall is as high as 1 1, 700 mm The driest place is Death Valley in California, with an average annual rainfall of less than 50 mm Death Valley is also the hottest place in the United States. The highest temperature is as high as 57℃, and the highest temperature in July 2003 is 1, 9 1. The lowest temperature in the United States is -62℃, recorded in Prosper Bay, Alaska, which is 65,438+0,65,438+0.

Population and ethnic origin

According to the decennial population survey, the current population of the United States is 226,545,805 in 1980, of which 1837 10000 is white and 26.49 million is black. Black people are the largest minority in this country. 1 1% of the total population. 6 million mexican american, including whites, is the second largest minority in the United States. There are nearly 800,000 American Indians in the United States. Every American is basically an immigrant or a descendant of immigrants. Indians, Eskimos and Hawaiians were the first indigenous people to settle in America. Most of the early immigrants in the United States came from Europe. But before and after the American Revolution, a large number of immigrants flocked from all over the world, including Germans in Pennsylvania, Dutch in new york, French in Louisiana and Spanish in Florida and California. At the same time, there are many black slaves imported from Africa in the south. Agriculture. From 1840 to 1860, nearly 4.4 million immigrants flooded into the United States. They are attracted by developing cities and industries, fertile soil, undeveloped land in the west, freedom and wealth. Immigrants kept pouring into the United States, and it was not until the early 20th century that the United States passed laws to limit the number of immigrants. The Second World War left thousands of Europeans homeless. So America opened its doors again. From the end of the 1945 war to today, the United States has accepted as many as 9 million immigrants. However, most Americans are born in America now. /kloc-out of 0/00 people, only nearly 5 people were born in other places. Only nearly 18 out of 100 people are immigrants. Or descendants of immigrants. The foreign countries are Italy, Germany, Poland, Russia, Mexico, England and Wales. The United States has always been regarded as a melting pot, and its people belong to different races and come from different countries. However, they developed the same culture. Most people follow American customs and traditions, and even take an active part in political parties. But there are also some outsiders.