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The crust is composed of two basic rock types granite and basalt. 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.arth's rocky surface is divided into two types: oceanic crust, with a thin dense crust about 10 km thick, and continental crust, with a thick light crust about 40 km thick.
The oceanic crust is 5 km (3 mi) to 10 km (6 mi) thick and is composed primarily of basalt, diabase, and gabbro. The continental crust is typically from 30 km (20 mi) to 50 km (30 mi) thick, and is mostly composed of slightly less dense rocks than those of the oceanic crust.Some of these less dense rocks, such as granite, are common in the continental crust but rare to absent in the oceanic crust.he Earth's oceanic crust is aproximately 0-6 miles (0-10 km) thick while the continental crust is apx. 0-31 miles (0-50 km) thick. I wrote the rages because the crust's thickness varies depending on where you are.