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Survey of the USAFoundation : 1776.7.4. The fourth largest country in the world Position : the central part of North America; Alaska in the northwestern part of North America and Hawaii inthe central Pacific Ocean.Northern temperature zone. North: Canada; South: Mexico, the Gulf of Mexico; East: Atlantic Ocean; West: Pacific Ocean Area: 6% of the Earth ≈ the whole Europe(三大河流体系 )The three river systems in the USA are: the system of the Gulf of Mexico, the system of the Atlantic Ocean and the system of the Pacific Ocean. (三大山脉 ) three great mountain ranges: the Appalachian Mountains, the Rocky Mountains and the Great Cordillera Mountain Range. (the Pacific 河流体系的两大河流) the Columbia River and the Colorado River. (美国 /世界最长的河流)the Mississippi River is the most important river in the system of the Gulf. The Rocky Mountains(落基山脉 ) are “the backbone of the continent ”. Great lake(美国五大湖 ) They are located in the northeast part of America. 由西至东 :Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario. (黄石国家公园 )Yellowstone National Park，Wyoming /(大峡谷 )Grand Canyon / Three basic geographical areas or surface regions: 1) The Atlantic Seacoast and the Appalachian Mountains in the east Eastern Coastal Plain; The first 13 colonies：1624, Virginia 1629, New Hampshire 1632, Maryland 1662, Connecticut 1663, Rhode Island 1664, New York 1664, New Jersey 1681, Pennsylvania 1682, Delaware 1691, Massachusetts 1713, North Carolina 1713, South Carolina 1732, Georgia 2) The great Mississippi River Valley in the middle Between Appalachian and the Rocky Mountains, 2,000 km from east to west Chicago Great Plain: west part of Mississippi Valley 3) The Rockies west to t...