Here's a breakdown:

* Crust: The outermost layer of Earth, composed of solid rock.

* Rock: A naturally occurring solid material made up of one or more minerals.

Types of Crustal Rocks:

* Igneous rocks: Formed from the cooling and solidification of magma (molten rock) or lava. Examples include granite and basalt.

* Sedimentary rocks: Formed from the accumulation and cementation of sediments. Examples include sandstone, limestone, and shale.

* Metamorphic rocks: Formed when existing igneous or sedimentary rocks are transformed by heat, pressure, or chemical reactions. Examples include marble and slate.

Note: While rock is the basic material, its composition can vary greatly depending on the specific type of rock and its origin. The crust is also made up of various other components, including minerals, gases, and trace amounts of other elements.