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As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

Which technological breakthrough of the 1950s revolutionized the way that americans kept up with news and world events? a) radio b) internet c) television d) motion pictures

How did the southeast asia treaty organization (seato) carry out the united states policy on containment? a. seato promoted the creation of united nation military bases to create regional defense. b. seato founded an organization seeking to educate southeastern asian countries on communism. c. seato established a regional economic union to promote monetary security. d. seato sought to provide regional security in southeast asia by establishing alliances.