.
The Midwest
New England
The Pacific Northwest
The Southwest
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Red
Blue
Green
Brown
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1, 3, 4, 2
2, 1, 3, 4
3, 2, 1, 4
4, 2, 1, 3
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River
Lake
Road
Mountain
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Erosion
Ocean tides
An earthquake
Volcanic eruptions
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Tennessee and Arkansas
Louisiana and Mississippi
Arkansas and Mississippi
Alabama and Arkansas
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Texas and Louisiana
Washington and Oregon
Ohio and Pennsylvania
New York and New Jersey
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Area 1
Area 2
Area 3
Area 4
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Bridge
Tunnel
Canal
Dam
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