Any geophysicists here?

https://www.youtube.com/watch?v=4XNMCTBdQtk

Watching this video raised a question. When a magnet is heated it looses it's magnetism, that is, if it had any to start with...I was told this by my science teacher many moons ago and have learned so when permanent magnet electric motors overheat.

Being 2000 miles down, no one can go see what state it is..

So, being as 'they' believe the earth's core is a molten sphere, how come it is giving off a magnetic field...magnetosphere, that is a very effective shield from solar radiation ?


One final question...Is this magnetism the same thing as gravity ? Nothing I have read explains what phenomenon gravity is.


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