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Marine magnetic anomalies are variations in the Earth's magnetic field recorded on the ocean floor. These anomalies are primarily due to the differing magnetic properties of basaltic rocks formed at mid-ocean ridges. As magma rises and solidifies at these ridges, the iron-rich minerals in the basalt align with the Earth's magnetic field at that time, recording its polarity. Over geological time, the Earth's magnetic field has undergone numerous reversals, ________ _______ _______ __________ _____ ________ ___ _________ _____ ____.
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