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<p>uses the <a href="page.php?w=Magnetic_polarity">polarity</a> reversal history of Earth's magnetic field recorded in rocks to determine the age of those rocks. Reversals have occurred at irregular intervals throughout <a href="page.php?w=History_of_Earth">Earth's history</a>. The age and pattern of these reversals is known from the study of sea floor spreading zones and the dating of <a href="page.php?w=volcanic_rock">volcanic rock</a>s.</p>

<p><big>Principles</big></p>
<p>The study of paleomagnetism is possible because <a href="page.php?w=iron">iron</a>-bearing</p><p>
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