Drawing the Earth with its layers in correct proportions:
Inner core, outer core, Gutenberg layer, 410 km discontinuity, 250 km discontinuity, tectonic plate bottom line at 120 km depth, surface with radius 6371 km.
Six currents added to outer core, with equal hight and bredth. It coincides with the outer limits of the Gutenberg layer.
Convection rolls sections added with same hight and bredth to the lower mantle. They coincide with the lower limits of Gutenberg layer and 410 km depth from surface.
The convection rolls sections are further identified with vertical lines where they are divided from each other.
The remaining layers are also filled with convection rolls sections, with identical height and bredth. The section of the convection rolls model is thereby ready.
This is how it works 🙂
Then this is traced to the north and south, and finally compared with the surface and our general knowlede about the Earth, based on measurements, physics and calculations.