(how magnets are formed) "Some very ferromagnetic (easily magnetized) materials naturally become magnetized if they sit in one direction within Earth's magnetic field for a long time undisturbed."
I also find it fascinating that they retain this property even if they've left the Earth (magnets still work on the Moon). So the rocks like Quarts and magnets obtained their properties from the Earth, but they are not constantly feeding upon it. They are permanently changed to be that way. It's not that the material is just reflecting magnetism - it is actually changed permanently and exhibits the property itself.

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