The floor of heavier rock under the oceans is composed of

The continental crust is composed mostly of granite. The oceanic crust consists of a volcanic lava rock called basalt. Basaltic rocks of the ocean plates are much denser and heavier than the granitic rock of the continental plates.

From google

i had this on my unit activity, i can you if you are a plato student. are you a plato student?

i think it is true since you can test the answer and can use observations to complete it.