the lithosphere, which contains all of the cold, hard, solid rock of the planet's crust (surface), the hot semi-solid rock that lies underneath the crust, the hot liquid rock near the center of the planet, and the solid iron core (center) of the planet
the hydrosphere, which contains all of the planet's solid, liquid, and gaseous water,
the biosphere, which contains all of the planet's living organisms, and
the atmosphere, which contains all of the planet's air.
