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76. Why does the oceanic crust sink downward?
The oceanic crust sinks downward because it is mostly basalt in nature which is very dense material.
77. Why does the continental crust resist subduction?
The continental crust resist subduction because it is composed mostly of granite which is lower in density.
78. What occurs at a "hot spot" as crustal plates move over it?
79. What does the progression of volcanic activity through time actually show?
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