题目内容
The Rockies, the backbone of the North American continent, is also known as theContinental .
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The rivers that descend from the eastern slopes of the Rockies flow into the and the Gulf of Mexico. Those that begin on the western slopes of the Rockies flow to the Pacific Ocean and the Gulf of California.
The Great Lakes are the economic lifeline of the Midwest because they provide transportation for materials such as iron ore, coal, and grain.
The US Great Lakes are Lake Superior, Lake Michigan, Lake , Lake Erie and Lake Ontario.
Lake is the largest fresh water lake in the world while Lake Michigan is the only one almost entirely located in the US.
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