The structure of planet Earth can be divided into three parts: a crust, a mantle and a core.

The thickness of Earth's crust ranges from a few kilometers to tens of kilometers. The planet's crust is comprised of oceanic and continental plates. The oceanic plates are thinner than continental plates.

The planet's mantle is approximately 3 000 kilometers thick. The core of planet Earth, which consists of a liquid outer core and a solid inner core, is also approximately 3 000 kilometers thick.