Explain a method that is used for hydroelectric power to harness the energy.

What are the answers for the following questions?

What change took place in china's southwest region after the communists came to power? a) encouraged by government policies, the economic base of the region changed from agriculture to nòmadic herding. b) the communist government established a special economic zone in the region. c) the leader of the religion practiced in the region went into exile, d) the leader of the religion practiced in the region was executed.

The earth’s most important nonrenewable energy source is