Why does the oceanic crust sink beneath the continental crust at the world subduction zone?

a. the oceanic crust has greater density
b. the oceanic crust is pulled downward by earth's magnetic field
c. the oceanic crust is pulled from the rigde
d. the continental crust has a denser composition

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2015-08-02T18:05:57+08:00

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The answer is c. The oceanic crust is pushed from the ridge.

--Mizu
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