Do you think the center of the Earth is fire as they say it is; why or why don't you believe it?

The earth's density is too high for it to be rock all the way to the center so it must be denser at the core, and judging by the makeup of meteors it is likely nickel-iron. The earth's magnetic field is likely caused by currents in the core so it must be liquid. In order to be liquid it must be hot.