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Select the best answer for the questio 13. How often does Earth's magnetic field change direction? O A. About every two million years O B. About every three million years O C. About every four millions
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Select the best answer for the questio

13. How often does Earth's magnetic field change direction?
O A. About every two million years
O B. About every three million years
O C. About every four millions years
D. About every one million years

User Vincentsty
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14 votes
Letter D is correct
About every one million years
User MUGABA
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6 votes
D. About every one million years
User Sivanesh S
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