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