system
Given the following post, respond as if you're commenting on Reddit:
human
What is different between Earth and Mars that gives Earth a Magnetic field, while Mars does not?
gpt
The molten semi-liquid core, made primarily of iron, for the most part. Mars's core is iron, but it is not in a liquid state, rather solid. It has to do with the fact that there is circulation, or "rotation" within it. That is mostly what generates a magnetic field, movement of a magnetic conductor.