The Earth's inner core.
The crust and mantle.
This diagram details the Earth's internal structure and, whilst it is some what impressionistic (with the divisions between the regions being less well defined in reality than on the artwork), the relative sizes of the core, mantle and crust are correctly proportioned.
The textures that have been applied to the different zones reflect, albeit artistically, the nature of the liquid and semi-liquid states of the outer core and parts of the mantle. The inner core, as indicated by the illustration, has a solid composition.
The heat flow processes that occur in the Earth's mantle, and cause the tectonic movements within the crust layer, have also been highlighted on the model.
Data from the following source was used in the compilation of this model: Blue Marble: Next Generation: NASA's Earth Observatory.