Answer :

Every couple thousand years, Earth's magnetic field switches poles.
A magnetic material called hematite found near mid-ocean ridges records positive and negative in stripes parallel to the ridge, evidence that over time the crust was produced and pushed away from that ridge over time.

Answer: A magnetic material called hematite found near mid-ocean ridges records positive and negative in stripes parallel to the ridge, evidence that over time the crust was produced and pushed away from that ridge over time.

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