the relationship between the earths crust and the ocean sizes is So much of the Earth is hidden from view. You see some of the rocky crust, but that’s only 1 percent of the Earth’s mass. Beneath the crust is the dense, semisolid mantle, which accounts for 84 percent. The rest of the planet’s mass is the core, with a solid center and a liquid outer layer. The crust and the very top of the mantle make up the lithosphere. This solid portion of the Earth has been identified because it continually moves in slow motion.