Describe how/why earth is layer the way it is

Denser objects and substances experience a greater gravitational force acting upon their mass. This is why materials of different densities form layers. ... It is less dense than the Earth's crust, which is a solid. This is why the Earth's surface and atmosphere form distinct layers.

                                       pls give brainliest if this helped :)

you need to have a picture of the atom that way we can answer it