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| A high point on a ridge that determines the direction of rivers |
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| A boundary in the eastern U.S. where the higher land of the Piedmont drops to the Atlantic coastal plain |
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| Areas in which fish or sea animals are caught |
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| Elevation above where it is too cold for trees to grow |
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| Seasonal warm wind that blows down the rockies the Rochkies in the late winter and early spring |
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| Violent thunder storms that can spawn tornados |
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| The movement of people from one country to another |
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| The movement of people from rural areas into cities |
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