Earth is chemically heterogeneous because partitioning has operated repeatedly across its history: each episode of melting, crystallisation and fluid transport moves elements between phases, and the differences accumulate into reservoirs of contrasting composition.
- method: Combines the partitioning mechanism with the layered outcome recorded in the Phase 1 interior canon.
Evidence support: Supported by the cited evidence 3 sources, multiple sources, independence unknown
Evidence: Blundy 1994 Peer-reviewed; Kious 1996 Primary authority; U.S. Geological Survey n.d. Primary authority