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So paleomagnetism can really be thought of as the study of an ancient magnet field. Some of the strongest evidence in support of the theory of plate tectonics comes from studying the magnetic fields surrounding oceanic ridges.
This effect is a weak form of paramagnetism known as Pauli paramagnetism. The effect always competes with a diamagnetic response of opposite sign due to all the core electrons of the atoms. Stronger forms of magnetism usually require localized rather than itinerant electrons.