The study of paleomagnetism examines the record of Earth's magnetic field preserved in igneous rocks. When magma coo__ __ at mid-ocean rid__ __ __, iron-rich mine__ __ __ __ align thems__ __ __ __ __ with the prevailing magnetic po__ __. Once the ro__ __ solidifies, th__ __ alignment is loc__ __ __ in pla__ __, creating a perma__ __ __ __ historical rec__ __ __. Because the planet's magnetic fi__ __ __ undergoes periodic reversals, the seafloor acts like a giant tape recorder. Scientists map these alternating bands of normal and reversed polarity to track tectonic plate movement., The study of paleomagnetism examines the record of Earth's magnetic field preserved in igneous rocks. When magma cools at mid-ocean ridges, iron-rich minerals align themselves with the prevailing magnetic pole. Once the rock solidifies, this alignment is locked in place, creating a permanent historical record. Because the planet's magnetic field undergoes periodic reversals, the seafloor acts like a giant tape recorder. Scientists map these alternating bands of normal and reversed polarity to track tectonic plate movement., ------.

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