Quote:
Originally Posted by CraigS
Surely if its hot, there must be motion ??
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Depends on how it's being heated. It could be that syrupy thick that it hardly moves at all, or it could be just slowly bubbling away with vertical motion. Depends a lot on what's in the liquid as to what its consistency is going to be like. If it has an appreciable amount of sulphur or oxygen in the core, it'll be fairly fluid. If it's pretty much all iron or iron/nickel, it will be very sticky and gloopy and it would take a lot of heat to generate appreciable currents in the material.