Option

Symbol

Units

Value

Earth age

$t_P$

billion years

4.567

Earth radius

$R_E$

Km

6371

Earth’s core radius

$R_{EC}$

Km

3471

The relative size of Earth’s core

$\frac{R_{EC}}{R_E}$

-

0.5448

Average core density in a homogeneous model

$d_{EC}$

tons/m³

11.71

The average density of the Earth’s core under a double-layered model

Inner core

$d_{EC}$

tons/m³

24.83

Core-shell

11.08

Average core density

16.35

The average density of the mantle and earth’s crust

$d_{CC}$

tons/m³

4.66