Earth's magnetic field has reversed nine times in the last four million years.

Name: Earth's magnetic field has reversed nine times in the last four million years.
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This statement is true. Earth's magnetic field has undergone numerous reversals throughout its history, with the most recent occurring about 780,000 years ago. The frequency of these reversals is not entirely regular, but on average they occur about once every 250,000 years.

Earth's Magnetic Field Has Reversed Nine Times in the Last