Complex social
systems developed
into early civilizations

What can happen to solar radiation when it enters earths atmosphere? check all that apply 1)it is absorbed by earth. 2)it is reflected by clouds. 3)it is reflected by glacial ice. 4)it is condensed into visible light. 5) is amplified by water molecules.

Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste? a. coal b. nuclear c. solar d. oil

In 2002, north korea announced that it was shutting down its nuclear facilities constructing a hydroelectric energy plant restarting nuclear weapon development changing to a free market economy