* Oceanic crust: This is found beneath the ocean basins and is thinner and denser than continental crust. It's primarily composed of basalt and gabbro, dark-colored, fine-grained igneous rocks.
* Continental crust: This is thicker and less dense than oceanic crust and makes up the continents. It's more diverse in composition, containing a variety of igneous, sedimentary, and metamorphic rocks, including granite.
So, the answer depends on whether you're talking about oceanic plates or continental plates.
