Cosmochemical approach | The composition of the Earth is based on the enstatite chondrites, which show a closer isotopic similarity with the mantle and an iron content high enough to explain the terrestrial metallic core | 11 ± 2 TW |
Geochemical approach | For the relative abundances of the lithophile refractory elements it adopts a chondritic composition, then placing limits on the absolute abundances from terrestrial samples | 20 ± 4 TW |
Geodynamical approach | It is based on the hypothetical energetics of mantle convection and on the observed heat flux on the surface | 33 ± 4 TW |
Borexino experiment | Observed best value | 18 - 28 TW |
KamLAND experiment | Observed best value | 8 - 16 TW |