Dams are built to create reservoirs.
over rivers
people build briges
people build briges
what do people build to cross deep rivers or valleys?
they build dams
Bridges
the river might erode the land around it causing the peoples houses to fall in and also the people have to build a bridge across to cross it and get to the other side
People in south America build dams on the major rivers to get more electricity. Plus, there is more industrialization in the area.
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.
The Inca built their roads in a wide variety of terrain including bridges across rivers, mountains, deserts, and jungles.
Cities are build beside rivers because if people wanted to go fishing they could catch fish in the rivers.