Answer:
D) 250,000 yrs.
Step-by-step explanation:
Earth's magnetic poles reverse approximately every 250,000 years.
D. 250,000 years
It's really 200,000 to 300,000 years, but 250,000 years is right in the middle, so it must be 250,000 years.
Hope this helps you! Good luck with your exam/quiz! <3
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