Which alabama governor stood in the doorway of the university of alabama to prevent two african-american students from enrolling there?

How did geography influence the development of the byzantine empire?

What new concept did the the american revolution introduce into the world

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