The magic school bus on the ocean floor

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    the north magnetic pole becomes the south pole and vice versa. Hence, the Earth has experienced periods of reversed polarity alternating with times (like now) of normal polarity. Although the magnetic field reverses at these times, the physical Earth does not move or change its direction of rotation. Basaltic lavas contain iron-bearing minerals such as magnetite which act like compasses. That is, as these iron-rich minerals cool below their Curie point, they become magnetized in the direction of the surrounding magnetic field. Studies of ancient magnetism ( paleomagnetism ) recorded.

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