The earth is made up of layers (crust, mantle, outer core, and inner core). Each one has a unique make-up to it. This is the outer layer of the Earth about 10 miles or so thick. Mostly made up of rock and loose material
Over 90% of Earth's crust is made up of Igneous rocks by volume, but is not really noticeable because they are mostly covered by sedimentary and metamorphic rocks.
