英美文化背景与国家概况之美国地理精品PPT课件

Rivers and lakes
The main rivers and mountains of America
Mississippi River , it flows about 6400 kilometers from its northwestern source in the Rockies to the Gulf of Mexico ,Its tributaries include nearly all the rivers west of the Appalachian mountains(阿帕拉契山脉) and the east of the Rockies .
The scenery of Potomac river
The scenery of Potomac river
Grand Canyon(科罗拉多大峡谷)
Great lakes , of these five lakes only one , Lake Michigan , belongs to America completely while the other four are shared with Canada . These five lakes , with an area of about 240000 square kilometers , constitute the largest lake group in the world .
Big steamship on Mississippi
Mississippi
Big dam on Mississippi
Rockies
Potomac river(波托马克河) , it is famous not only because Washington D.C ,it is regarded as the traditional dividing line between the South and the North .
Great lakes 五大湖
Great lakes 五大湖
Lake superior
Lake Michigan
Lake Huron
Lake Erie
Lake Ontario
Niagara Falls
The five lakes slope downward towards the east . Lake Erie is over 100 meters higher than Lake Ontario and the river that connects them is called Niagara（尼亚加拉） River . The steep drop in elevation gives birth to the Niagara Falls , it attracts large numbers of visitors from around the world .
The distribution of the forests
Forests and Mineral Resources
Sequoia(红杉)
3000 years old
Diameter：6 meters Towers：100 meters
The biggest tree in the world
silver .
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Niagara Falls
Niagara Falls
The biggest falls in the world
Niagara Falls
Niagara Falls
America has been known for its rich forest resources . When the first European colonists arrived , America was still covered with dense forests , stretching about 1600 kilometers inland(国内的) from the Atlantic Coastline . Today about one-third of the United States is still covered with forests
Topographic map of the United States of America 美国地形图
Land Resource
About 47% of America’s land area
can be used for agricultural purposes，including 400 million acres of arable（适于耕种的） cropland and 900 million acres of permanent pastureland（牧场）。
2011
来自百度文库2114122259
White House
contents(156-162)
1、Land Resource 2、Rivers and Lakes 3、Forests and Mineral Resources 4、New Problems
Uncle Sam
Satellite map of America 卫星地图中的美国
The United States is rich in
mineral resources . It ranks among
the countries with the greatest reserves(储藏量) of coal , iron ore , and oil . It also abounds(富于) in lead（铅） ,copper（铜）, zinc （锌） , gold , aluminum（铝） , phosphate（磷酸） rock , and