How do magnetic properties of seafloor rocks support the theory of plate tectonics?

Question

Quizplus · Accepted Answer

As seafloor rocks cool, they record the direction of the Earth's magnetic field at that time. By analyzing the orientation of the magnetic minerals in the rocks, scientists have discovered that the direction of magnetic north has flipped multiple times throughout history. This supports the theory of plate tectonics because it shows that the seafloor is spreading and moving away from mid-ocean ridges, and that the Earth's magnetic field has also changed over time.

How Do Magnetic Properties of Seafloor Rocks Support the Theory