Why must farmers in the western states of the midwest irrigate?

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 does central place theory explain patterns in the size and distribution of cities?

The inner planets mercury, venus, earth, and mars were formed by