How do we know Earth’s magnetic fields flip in intervals of 200,000-300,000 years?

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Came across a (https://www.youtube.com/watch?v=g6thUIR3_rI) which describes Earth’s magnetic field having switched hundreds if not thousands of times during Earth’s 4.5 billion years.

So, how do we know thats a fact? What are scientists looking at that helped them determine this?

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Anonymous 0 Comments

I don’t know for sure, but I believe it’s due to the way rocks form. You can see a difference in the structure if the magnetic field is reversed. I assume it’s the direction of the grain found in ferrous material.

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