Archeomagnetic dating

The stronger component known as the Earth’s poles, reverses direction at irregular intervals.The weaker variations are the Earth’s magnetic map.

The term that refers to changes in the Earth's magnetic field in the past is paleomagnetism.The Earth's molten core has electric currents flowing through it.As the earth rotates, these electric currents produce a magnetic field that extends outward into space.Within these weaker areas the local directions and intensities change gradually (secular variation).A compass does not point to the true North Pole but to direction that is a function of the North Magnetic Pole and the local secular variation to yield a magnetic declination.

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