The iron core but there are many open questions https://news.mit.edu/2020/origins-earth-magnetic-field-mystery-0408 https://news.mit.edu/2020/origins-earth-magn

The iron core but there are many open questions https://news.mit.edu/2020/origins-earth-magnetic-field-mystery-0408 https://news.mit.edu/2020/origins-earth-magnetic-field-myste...