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ARC-Challenge / Mercury_7270165 / Oceanic crust is composed mainly of basalt. Continental crust is composed mainly…

Problem

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question

Oceanic crust is composed mainly of basalt. Continental crust is composed mainly of granite. Why does oceanic crust generally tend to subduct under continental crust when plates collide?

choices

  • The oceanic crust is thicker than the continental crust.
  • The continental crust is thicker than oceanic crust.
  • The oceanic crust is denser than the continental crust.
  • The continental crust is denser than the oceanic crust.

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Source and history

Official source

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