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Currently popular ideas about the Earth's interior have developed almostentirely on the basis of physics. In the spirit of the United Nations'designation of 2011 as the International Year of Chemistry, I unify chemicaland physical inferences for Earth-matter below the depth of 660 km. I relate byfundamental mass ratio relationships the internal parts of that region withcorresponding enstatite chondrite parts, providing a quantitative basis forunderstanding the "seismically rough" matter at the core mantle boundary, D'',as arising from Earth-core precipitates, the "core-floaters", CaS and MgS. Isuggest that the ultra-low velocity zone consists of CaS.

Chemical basis of deep-Earth physics: Emphasis on the core-mantle boundary D''