... For Teachers . ... Since no math is involved, they can be presented in a 9th grade Earth Sciences course, and even to younger students. ... Permanent magnetism and the magnetism of the Earth. Magnetism caused by electric currents . ... You may send comments, questions and corrections to my home address, earthmag("at" symbol)phy6.org . ... The teacher may skirt this area when the subject of the origin and reversal of the Earth's magnetic field comes up, by simply stating the bare facts, namely . ...