Appalachiske Bjerge

Source: Caseyjonz

Description

De Appalacherne, ofte kaldet Appalacherne, er et system af bjerge i den østlige del af Nordamerika. Appalacherne blev først dannet for cirka 480 millioner år siden under den ordoviciske periode. De nåede engang højder, der var sammenlignelige med dem i Alperne og Rocky Mountains, før de blev udsat for naturlig erosion. Appalacherkæden er en barrier for øst-vest rejser, da den danner en række skiftende rygge og dale, der er orienteret i modstrid med de fleste motorveje og jernbaner, der løber øst-vest.

Definitioner varierer med hensyn til de præcise grænser for Appalacherne. Den amerikanske geologiske undersøgelse definerer Appalachian Highlands som en fysiografisk division bestående af tretten provinser: Atlanterhavskystens højder, Øst-Newfoundland Atlanterhavet, Maritime Acadian Highlands, Maritime Plain, Notre Dame og Mégantic-bjergene, Vest-Newfoundland-bjergene, Piedmont, Blue Ridge, Valley og Ridge, Saint Lawrence Valley, Appalachian Plateau, New England-provinsen og Adirondack-områderne. En almindelig variant definition inkluderer ikke Adirondack-bjergene, som geologisk tilhører Grenville Orogeny og har en anden geologisk historie end resten af Appalacherne.

Source

Source: Wikipedia.org

Copyright: Creative Commons 3.0

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Contact information

Address: Fulton, United States

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