Here's a breakdown:

* Continental Crust: Primarily composed of granite, a light-colored igneous rock rich in quartz and feldspar.

* Oceanic Crust: Mostly composed of basalt, a dark-colored igneous rock rich in magnesium and iron.

While igneous rocks dominate the crust, sedimentary and metamorphic rocks also exist and play important roles.

Let me know if you'd like more details about these rock types!