Download "Discuss the degree to which the theory of Plate Tectonics is

"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.
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