In the last 20 million years,
Earth’s magnetic field has flipped several times.
What happens when it flips?

Question

Accepted Answer

North becomes South and vice versa. The reversal itself takes centuries or millennia. — Last flip: ~780,000 years ago. Rock magnetism preserves the record. Compasses would slowly rotate, then settle backwards.

In the last 20 million years, Earth’s magnetic field has flipped several times. What happens when it flips?