Question

Construction of big dams displace thousands of people and does great harm to the environment

Answer 1

because they have danger to be damaged this greats a great damage to environment because water give force on trees which creates greater damage by soil erosion

Answer 2

Explanation:

One of the first problems with dams is the erosion of land. Dams hold back the sediment load normally found in a river flow, depriving the downstream of this. In order to make up for the sediments, the downstream water erodes its channels and banks. This lowering of the riverbed threatens vegetation and river wildlife.