Describe the climate and vegetation on the tundra and the steppes

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.

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!

Which phrase describes the time it takes for a planet to make a complete rotation