Where did Earth's Iron core come from and how did the mantle become molten?

Does 'void and empty' convey molten to you?Empty by definition means "1 a : containing nothing" and void means "vacant" which begs the question of where did the iron core come from?Furthermore, as Archangel explicitly stated as in the record of this thread, he believes the Earth was "an old dead rock." How did an old dead rock become molten?

Which is a key problem of many Creationists. They want to be taken seriously, thus they attempt a science angle yet their beliefs are inherently not science.