What happens to the density of the earth as you go from the outer layer to the core?

It gets harder, OK lets think of it like you head your brains the core, skull's the mantel and you hair/head skins the crust; your Skull (Mantel) is there to protect your Brain (core) because if you brain gets damaged you "could" died if the Core gets damage (more like destroyed) than the world would die. A long way of saying if it didn't get denser it would be more likely to be damage. if a meteor hit and there ways no density than the meteor would cut threw the earth like a Hot Knife threw butter.

(Like most answers Don't quote me on them this is just my opinion and the best one...see what i did there and the best one is a another opinion.)