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ahelling23:
To make up for the differences in elevation, the Great Lakes–St. Lawrence waterway system has _____ through which ships pass. hydroelectric plants highways locks river rapids
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KeigoTakami:
its a waterway right?
KeigoTakami:
so highway and rapids cant be it
KeigoTakami:
pretty sure its locks
KeigoTakami:
locks are water navigation
KeigoTakami:
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways.
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