Why don't boundaries of the American south correspond to the political boundaries of southern states

Witch one is it soo it the the question b.a,b,c,d

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons

What causes heat transfer in fluids