Communist china's policy in the 1960s of reigniting the revolutionary spirit, which involved mass jailing and executions, was called the a. cultural revolution. b. chinese revolution. c. great purge. d. communist revolution.

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste