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"Discuss the degree to which the theory of Plate Tectonics is supported by the distribution of (40 marks) volcanic activity across the globe." How does the global distribution of volcanoes and earthquakes support the idea the crust is split in to plates that move about and how doesn't the distribution of Vs and Es support this theory? What is plate tectonics theory? Generally speaking where are most Vs and Es found? Mention there are some exceptions to this rule e.g hot spots. Mention plumes may actually fit the theory. No depth here though. Map of Vs and Es shows a clear pattern Constructive example and destructive example Yes the distribtion does fit theory Convection currents move Mid ocean ridges and deep plates and earth not sea trenches getting bigger or smaller Yes the distribtion does fit theory Hot spots don't fit the theory Not all Vs and Es appear to fit Hawaii and East Africa Rift Hawaii chain of islands But even hotspots show evidence of plate movement But are mantle plumes the driving mechanism? Theory visible but these Vs not caused by it! Iceland and East Africa plumes So maybe all Vs fit theory afterall caused a rifting event Yes the overall distrbution of Vs and Es fits plate tectonic theory and while upon first glance it appears hot spots don't, if mantle plumes are the driving mechanm behind rifting event then actually all Vs and Es fit the theory. 1