- The oceanic crust mainly is made of basalt
- The continental crust mainly is made of granite
- Basalt is more dense than granite
- So, the oceanic crust is more dense than the continental crust

Therefore, the oceanic crust is more dense than the continental crust
[Question]A difference between the oceanic crust and the continental crust is that the oceanic crust is
[Context]- The oceanic crust mainly is made of basalt 
- The continental crust mainly is made of granite 
- Basalt is more dense than granite