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Geography 42 Online
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

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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