Here's a problem to solve: 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?

Among the 4 following options, which is the correct answer?

- A: The oceanic crust is thicker than the continental crust.
 
- B: The continental crust is thicker than oceanic crust.
 
- C: The oceanic crust is denser than the continental crust.
 
- D: The continental crust is denser than the oceanic crust.
 