People in south America build dams on the major rivers to get more electricity. Plus, there is more industrialization in the area.
people build briges
people build briges
what do people build to cross deep rivers or valleys?
they build dams
bridges...
Bridges
Dams are built to create reservoirs.
Rivers can get in the way when people are building homes, bridges, or roads. Often people will build dams to divert the river if it is in the way.
Cities are build beside rivers because if people wanted to go fishing they could catch fish in the rivers.
resevoirs
your mom
people in mesopotamia built canals for irrigation systems such as dams,buildings, and rivers