Which of above boundaries can produce volcanoes

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.

Mosses, lichens and shrubs can be found where in russia? a.grasslands b.mountain regions c.coastal plains d.siberian tundra

What type of coastline is commonly found along the western side of the america’s