We therefore need a record of how the position and strength of the Earth's magnetic field has changed over time.
Specific events can cause the magnetic materials to record information about the direction and strength of the magnetic field.


If we know how the magnetic field has changed over time, and we can measure the information held within the magnetic minerals about the past magnetic field, we can produce a date.





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First aid kit checklist for kitchen
Disaster preparedness guide for assisted living facilities
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