* The crust: This is the outermost layer of the Earth, and it's what we walk on. It's thinner than the mantle, and it's divided into two types:
* Oceanic crust: This is thinner and denser than continental crust, made up of basalt and gabbro.
* Continental crust: This is thicker and less dense than oceanic crust, made up of granite and other igneous and metamorphic rocks.
* The uppermost part of the mantle: This is the layer beneath the crust, and it's composed of peridotite, a dense, dark-colored rock.
Together, the crust and the uppermost part of the mantle form the rigid lithosphere, which is broken into tectonic plates.
