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experiment about the green house effect

The primary agent of contact metamorphism is

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.

Answer this asap. why did the americans go to china? a. trading b. exploration c. land d. live stock