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24 March, 19:48

How do scientists know the Earth's magnetic field has reversed itself many times in the past?

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  1. 24 March, 23:06
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    Changing frequency over time

    Explanation:

    Changing frequency over time. The rate of reversals in the Earth's magnetic field hasvaried widely over time. 72 million years ago (Ma), the field reversed 5 times in a million years.
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