Give two reasons why the apparent position of the Earth's geomagnetic pole

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Homework Statement

Give two reasons why the apparent position of the Earth's geomagnetic pole, as recorded by ancient rocks, may not correspond to its present position.

The Attempt at a Solution

Continental drift? So what is recorded by ancient rocks is not totally accurate because it was recorded when the rocks were not at their present position? What other reasons can there be?

 

[Whovian]

There's also the fact, that if I remember correctly, the geomagnetic pole may be drifting, so its position is not constant?