>>11252057 (lb)
Working for a nick-el is the devil
What's at the core?
Where did the iron-nickel core of the Earth come from?
Did the moon bring it?
Who was it a gift from?
We are all made of stardust
Who put the dynamo in the earth?
Why aren't we using it?
The magnetic field of the Earth. While it seems to be generated mostly by fluid and electric currents in the outer core, those currents are strongly affected by the presence of the solid inner core and by the heat that flows out of it. (Although made of iron, the core is apparently not ferromagnetic, due to its extremely high temperature.)[citation needed]
The Earth's mass, its gravitational field, and its angular inertia. These are all affected by the density and dimensions of the inner layers.[18]
The natural oscillation frequencies and modes of the whole Earth oscillations, when large earthquakes make the planet "ring" like a bell. These oscillations too depend strongly on the density, size, and shape of the inner layers.
https://en.wikipedia.org/wiki/Earth%27s_inner_core