To make up for the differences in water levels between the ocean and the Great Lakes, the St. Lawrence Seaway includes a series of ____.
To make up for the differences in water levels between the ocean and the Great Lakes, the St. Lawrence Seaway includes a series of lock.
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Asked 12/18/2016 1:00:15 PM
Updated 12/18/2016 8:41:46 PM
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jeifunk [12/18/2016 8:41:46 PM]
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