#2840: Earth Layers

XKCD comic, described below.
Transcript

[Header/Title]

The layers of the Earth

[Cutaway diagram of the Earth, a sphere with abstract sea/land/elevation surface, except for a slice removed (quarter-arc in three axes) to make visible a number of roughly equally-sized 'strata'/shells, all the way down to the intact smallest sphere. From surface downwards, these are:]

Lithosphere/crust (50/50 blend)

Upper mantle

Deep mantle

Filler

Vitreous humor

Mechanical/HVAC layer

Guacamole

Cytoplasm

Cork

Insulation

Seeds

Pith

Nougat

Outer core

Inner core

Secret core

[The central sphere:]

Kinder toy capsule


(Sourced from explainxkcd.com)

The Earth's magnetic field is primarily generated by currents in the liquid outer core, though some geophysicists argue that an unexplained mismatch with models suggests that the Kinder toy contains a magnet.

ExplainOriginal