fearlove
Posts : 35
 |  Subject: Appalachian Mountains  Wed Nov 30, 2011 9:52 pm | |
| The Appalachian Mountains (i/ˌæpəˈleɪʃɨn/ or /ˌæpəˈlætʃɨn/[note 1]), often called the Appalachians, are a system of mountains in eastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period.[3] The Appalachian chain is a barrier to east-west travel as it forms a series of alternating ridgelines and valleys oriented in opposition to any road running east-west. Definitions vary on the precise boundaries of the Appalachians. The United States Geological Survey (USGS) defines the Appalachian Highlands physiographic division as consisting of thirteen provinces: the Atlantic Coast Uplands, Eastern Newfoundland Atlantic, Maritime Acadian Highlands, Maritime Plain, Notre Dame and Mégantic Mountains, Western Newfoundland Mountains, Piedmont, Blue Ridge, Valley and Ridge, Saint Lawrence Valley, Appalachian Plateaus, New Eng Deutsch Tschechisch ÜbersetzerVector Clip art | |
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