New research reveals that Earth's mantle is split into two halves, with one section containing most of the planet's land and the other covering the Pacific Ocean. This division emerged when supercontinent Pangaea broke apart, reflecting the creation and destruction of Rodinia and Pangaea over approximately the past billion years. The study finds that the African domain has a higher diversity of elements and isotopes compared to the Pacific domain.

Source: https://www.livescience.com/planet-earth/geology/earths-mantle-is-split-into-two-halves-thanks-to-supercontinent-pangaea