The Appalachians formed as a result of orogenic activity

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      450-500 million years ago
      400 million years ago
      250-350 million years ago
      b and c
      all of the above
asked Mar 12, 2013 in Earth Science by anonymous
    

1 Answer

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all of the above
answered Mar 15, 2013 by h20 ~Top Expert~ (6,320 points)

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