Most of the evidence for magnetic reversals comes from lava flows on the continents.

Name: Most of the evidence for magnetic reversals comes from lava flows on the continents.
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Lava flows on the continents contain minerals that align with the Earth's magnetic field at the time the lava cools and solidifies. By analyzing the orientation of these minerals, scientists can determine the direction and strength of the Earth's magnetic field at that time, and identify periods of magnetic reversal.

Most of the Evidence for Magnetic Reversals Comes from Lava