Not sure about all that but algore at least let us know that the center of the earth is millions of degrees. Or was it thousands of degrees. Either way, if it goes cold, well, ain’t nobody getting away.
I remember reading that the eggheads think that was what went South for Mars. Once the liquid core cooled it was over there. No more Van Allen Belt, no more atmosphere, no more surface water. Just a chain of dominoes.