Here's a breakdown:

* Igneous rocks are formed from the cooling and solidification of magma (molten rock) or lava. These rocks are common in the continental crust, particularly granite and its variations.

* Metamorphic rocks are formed when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are transformed by heat, pressure, or chemical reactions. Many metamorphic rocks like gneiss and schist are also found in the continental crust.

While sedimentary rocks are also present in the continental crust, they are less abundant compared to igneous and metamorphic rocks. They form from the accumulation and cementation of sediments.