[Steve Van Doorn]

Both of your arguments of valid. The margin of error and liquid in side the mass. I lean toward magnetism of the system primarily the sun and the moon. Look at the how the magnetism of the moon moves our oceans giving us tides. Those magnetic waves likely effect the interior of our plant as well.

With the magnetic pole shift coming we should see some very interesting events taking place never seen before in written history.

[Magnum44]

Lunar gravity is the source of tides. The moon has no substantial mag field. The Earth relies on its mag field to protect us from solar radiation. I dont know about venus but I suspect it does have one, or, like mars (which doesnt have one of any significance), its atmosphere would be stripped away.

The mag field is actually a result of, not an effect on, the interior molten core. It is the movement of the liquid ferrous magma that creates the field.

That was fun to say :)