How does geologists determine the fault line age?

Which of the following statements best explains why there tends to be a greater number of large cities in southern africa than the east africa

What did the pattern of earthquakes in the wadati-benioff seafloor zones show scientists? a.) earthquakes occur where the ocean floor reaches its highest temperatures. b.) many earthquakes take place 700 kilometers below the seafloor. c.) slabs of ocean floor return to the mantle in subduction zones. d.) ocean - trenches cause earthquakes.

How many years is a term in the senate