30. The proportion of African Americans was higher in the Southern Colonies because (1 point) A. They were free States
B. Slave labor proved profitable on plantations
C. They preferred the climate
D. They found work in the industries

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