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<p>and to mantle plumes.</p>

<p>Tectonic plates may include continental crust or oceanic crust, or both. For example, the <a href="page.php?w=African_plate">African plate</a> includes the continent and parts of the floor of the <a href="page.php?w=Atlantic_Ocean">Atlantic</a> and <a href="page.php?w=Indian_Ocean">Indian</a> Oceans.</p>

<p>Some pieces of oceanic crust, known as <a href="page.php?w=ophiolite">ophiolite</a>s, failed to be subducted under continental crust at destructive plate boundaries; instead, these oceanic crustal fragments were</p><p>
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