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Geomagnetism covers questions related to the Earth’s magnetic field, its origin, history and measurement. Use electromagnetism for more general questions on magnetism.
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Why don't the Earth's oceans generate a magnetic field?
The earth's oceans do in fact generate a measurable magnetic field$^{[1][2]}$. As you have already pointed out, the motion of charged particles generate magnetic fields, so it makes sense that the ear …