::Appalachian Mountains

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The Appalachian Mountains ({{#invoke:IPAc-en|main}} or {{#invoke:IPAc-en|main}},<ref group="note">There are at least eight possible pronunciations depending on three factors:

  1. Whether the stressed vowel is /[[{{#invoke:IPA symbol|main}}|eɪ]]/ or /[[{{#invoke:IPA symbol|main}}|æ]]/,
  2. Whether the "ch" is pronounced as a fricative /[[{{#invoke:IPA symbol|main}}|ʃ]]/ or an affricate /[[{{#invoke:IPA symbol|main}}|tʃ]]/, and
  3. Whether the final -ia is the monophthong /[[{{#invoke:IPA symbol|main}}|ɨ]]/ or the vowel sequence {{#invoke:IPAc-en|main}}.</ref> French: les Appalaches{{#invoke:Category handler|main}}), 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.<ref name="aaas">{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref><ref name="usgs2">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> 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.<ref

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|CitationClass=web }} </ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }} </ref> 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.<ref

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Appalachian Mountains sections
Intro  Overview  Geography  Geology  Ecology  Influence on history  See also  Footnotes  References  External links  

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