How does the ocean floor keep track of the magnetic field

Here is the correct answer of the given question above: 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. Hope this answer helps. 

The enviroment with hedge hogs

5×^2+20-15 or -(5x^2-20+15)