What great geological event explains the formation of the Great Lakes, the St. Lawrence River system, the Columbia -Snake River system, and Great Salt Lake?
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What great geological event explains the formation of the Great Lakes, the St. Lawrence River system, the Columbia -Snake River system, and Great Salt Lake?
Great Lakes Formation
TEACH Geography
Great Lakes - MSN Encarta
St. Lawrence (river) - MSN Encarta
Hope these help you in some way.
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