How does the ocean floor keep track of magnetic fields?

The sea floor magnetic field is layered in stripes of alternating north and south polarities. That tells us the polarity of the Earth while that particular stripe was being formed. This is how the ocean floor keeps track of the magnetic field.

Explanation:

this is the answer i have had this question on multiple tests and got it right hope this helps! :D

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: