Earths magnetic field?

Question

Websites claim the magnetic field is generated in the outer core, but how has this been proved?

Answer 1

There is no real proof but it has been postulated from scientific principals.  It has to do with particle flow in a flowing liquid core.  There is some theories that the solid inner core is like one big magnet too.

Answer 2

The outer core is liquid iron nickel. We know that it is liquid because it will not support S waves generated by earthquakes. The inner core is solid because it will support S and P waves. We  know that the core is probably nickel iron from examining meteorites and having calculated the density of the earth. That indicates that the core is mostly like iron-nickel