The Rocky Mountains began forming

  1. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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  2. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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  3. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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  4. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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  5. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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  6. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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  7. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains the Rocky
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  8. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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  9. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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  10. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the
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