Cleared riverbeds
Created staircase locks to move up and down natural elevations
Deep cuts bu...
Cleared riverbeds
Created staircase locks to move up and down natural elevations
Deep cuts busted into rocky plateaus
Created cement to harden under water
15. These environmental modifications were made in order to construct the -
a. Lowell Mills
b. Transcontinental Railroad
C. Erie Canal
d. Port of Baltimore
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