The Earth's magnetic field has reversed itself many times in the geologic past.

Name: The Earth's magnetic field has reversed itself many times in the geologic past.
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The Earth's magnetic field has undergone numerous reversals of its polarity throughout geologic history, where the magnetic north and south poles switch places. This is evidenced by the magnetic patterns found in rocks on the ocean floor and in continental basalt flows.

The Earth's Magnetic Field Has Reversed Itself Many Times in the Geologic