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

While these modifications directly impact the local environment, they also ... For example, when a dam is built, less water flows downstream. ... <p>The mountains of the Cascade Range are visible over the Bonneville Dam

john maynrd keynes developed new economic respose to the                           ( b. great depression if the 1930's)

they change the constitution.