The convection cells of the mantle are symmetric and stable, constantly affecting our surroundings for billions of years. The basics are so simple that words are not necessary. Just have a look at this sketch below:
The Reykjanes Ridge is a good example, with a pair of convection cells underneath. These convection rolls extend over all the globe. The subject introduced here as the Convection Cell System of the Mantle is therefore based on a very simple precondition. How this section is then extended over the entire globe and all the relevant implications is of course a bigger piece to swallow 🙂
Magic Magma 