1. Crust: This is the outermost layer of the Earth, composed of relatively light, solid rock. There are two types of crust:

* Oceanic Crust: Thinner and denser, made up primarily of basalt.

* Continental Crust: Thicker and less dense, composed mainly of granite.

2. Uppermost Mantle: This is the solid, rigid part of the Earth's mantle that lies directly beneath the crust. It is made up of denser, more mafic rock than the crust.

So, while the lithosphere is often described as the "Earth's crust," it's technically a combination of both the crust and the uppermost part of the mantle.