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Appalachians : ウィキペディア英語版
Appalachian Mountains


The Appalachian Mountains ( or ,〔There are at least eight possible pronunciations depending on three factors:
#Whether the stressed vowel is or ,
#Whether the "ch" is pronounced as a fricative or an affricate , and
#Whether the final ''-ia'' is the monophthong or the vowel sequence .〕 (フランス語:les Appalaches)), 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 and once reached elevations similar to those of the Alps and the Rocky Mountains before they were eroded.〔(【引用サイトリンク】url=http://news.sciencemag.org/sciencenow/2009/11/03-02.html?etoc )〕〔(【引用サイトリンク】url=http://geology.er.usgs.gov/eespteam/Mtleconte/website/geology.html?etoc )〕 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 England province, and the Adirondack provinces.〔 name="USGS-Water">
〕〔
〕 A common variant definition does not include the Adirondack Mountains, which geologically belong to the Grenville Orogeny and have a different geological history from the rest of the Appalachians.〔 name=geomorph>〕〔 name=peakbag>
〕〔 name=weidensaul>

==Overview==

The range is mostly located in the United States but extends into southeastern Canada, forming a zone from wide, running from the island of Newfoundland southwestward to Central Alabama in the United States. The range covers parts of the islands of Saint Pierre and Miquelon, which comprise an overseas territory of France. The system is divided into a series of ranges, with the individual mountains averaging around . The highest of the group is Mount Mitchell in North Carolina at , which is the highest point in the United States east of the Mississippi River.
The term ''Appalachian'' refers to several different regions associated with the mountain range. Most broadly, it refers to the entire mountain range with its surrounding hills and the dissected plateau region. The term is often used more restrictively to refer to regions in the central and southern Appalachian Mountains, usually including areas in the states of Kentucky, Tennessee, Virginia, Maryland, West Virginia, and North Carolina, as well as sometimes extending as far south as northern Alabama, Georgia and western South Carolina, and as far north as Pennsylvania, southern Ohio and parts of southern upstate New York.
The Ouachita Mountains in Arkansas and Oklahoma were originally part of the Appalachians as well, but became disconnected through geologic history.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Appalachian Mountains」の詳細全文を読む



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