What are the two entities we look for involvement in an economic system

How do convection currents form underwater mountains?

:calculate the sum of the interior angles of a 13-sided polygon.

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.