Why do you think the sumerians built cities with walls around them?

Why was the taiping rebellion significant

How did the first punic war differ from the second punic war

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