45. the pax mongolica a. lasted for about two hundred years. b. brought destruction to china and mongolia. c. created new opportunities for merchants and traders. d. was ruled by the great khan from baghdad. e. lasted only until the death of the first great khan.

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.