Final answer:
The Earth is composed of three main compositional layers: the crust, mantle, and core.
Step-by-step explanation:
The Earth is composed of three main compositional (chemical) layers: the crust, mantle, and core. The crust is the outermost layer and is composed of solid rock. The mantle is the middle layer and is made up of semi-solid rock. The core is the innermost layer and is divided into the outer core, which is liquid, and the inner core, which is solid.
Learn more about Earth's Layers