Some of Earth's rocks retain traces of the magnetic field that point backward to its field today.

Name: Some of Earth's rocks retain traces of the magnetic field that point backward to its field today.
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Earth's rocks can indeed retain traces of ancient magnetic fields, a phenomenon known as remanent magnetization. This can show orientations that are opposite to the current direction of Earth's magnetic field, indicating periods of geomagnetic reversal.

Some of Earth's Rocks Retain Traces of the Magnetic Field