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> I believe that the current theory is that the heat is partially a leftover
> from the planet's formation, and partially from the natural decay or
> radioactive elements.
>
> I may be wrong. Geology isn't my forte.
>
That's the theory I read in some papers as well.
They say that if there was no radio-activity, the core and the mantle  shoud 
be solid and no more magnetic field and no more protection from Van Hallen 
belt thus no more life on Earth

Marc

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