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Geomagnetism

Tracking Variations in the Earth's Magnetic Field

Scientists have known for decades that the earth's magnetic field reverses from time to time, and that magnetic north fluctuates. Some wise guy (the Buddha) said once that everything changes all the time, and the only thing which doesn't change is the process of change. Anyway, the basic idea is that the magnetic field is not a static thing but varies and moves and changes.