Ap human geography why is the idea of two superpowers a relatively new one?

The meseta in spain is a a. navigable river b. castle c. coastal plain d.plateau

Can someone answer all these questions i need it done by tonight. once again

Most of the volcanic activity that occurs in the ring of fire is a result of the a. formation of mantle plumes away from plate boundaries. b. subduction of one plate under another. c. movement of two plates away from each other. d. sliding of one plate past another.