美国的人口与地理.pptxVIP

American;American geography;geographical features;The United States is located in the central part of North Amrica,except Alaska and Hawail.;It is the fourth largest country in the world in size after Russia,Canada and China.The country includes 50 states,Alaska and Hawail became the 49th and 50th states in 1959.;The eastern part consists of the highlands formed by the Appalachian Range(阿巴拉契亚山脉). It holds one-sixth of the continental American territory. ;rivers and lakes;the?most?important?lakes?in?the?United?States?are?the?Great?Lakes Lake Superion(苏必利尔湖）, Lake Huron（休伦湖） Lake Erie（伊利湖） Lake Ontario(安大略湖） Lake Michigan（密歇根湖） ; The Mississippi RIver : the longest river in North America, and a length of 3780 kilometers and a drainage area of more than three million square kilometers. It is known as the Father of Waters”.;Niagara?Falls,?one?of?the?world’s?greatest?natural?wonders,?can?only?be?described?as?breath?taking.?located on the US.-Canadian border between Lake Erie and Lake Ontario. ;Climate;temperate, with some mild subtropical zones. tropical：The southern Florida and Hawaii are . ;through the middle of the country, north to south, runs a well-known 50-centimeter rainfall line. ;major cities;The largest city in America. It is the center of commercial, financial, entertainment. It is also the headquarters of the United Nation. The heart of the city is?Manhattan?（曼哈顿）.? ;Washington 华盛顿 ;Chicago(芝加哥)：;American Population;People ;The United States is the third most populous nation in the world, ranking behind China and India. America has a population of 314 million(2012), with white people constituting about 80%.;The Great Plains :have a comparatively small population. ;Nation of Immigrants（移民国家） ;The United States is a nation of immigrants. America is not merely a nation, but a nation of nations. ;1. The first people on the American continent came from Asia as early as 12000 years ago. 2. In 1620, European immigrants as a symbol of their origins in thi