Why have locks been created between the Great Lakes and the St. Lawrence River? elevation between the areas is different to slow the shipping that goes through them to produce hydroelectricity to prevent

Why have locks been created between the Great Lakes and the St. Lawrence River?

elevation between the areas is different

to slow the shipping that goes through them

to produce hydroelectricity

to prevent flooding

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Why have locks been created between the Great Lakes and the St. Lawrence River? elevation between the areas is different to slow the shipping that goes through them to produce h…

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