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<p>of -2. Most of the <a href="page.php?w=Earth%27s_crust">Earth's crust</a> consists of oxides. Even materials considered pure elements often develop an oxide coating. For example, <a href="page.php?w=aluminium_foil">aluminium foil</a> develops a thin skin of  (called a <a href="page.php?w=Passivation_%28chemistry%29">passivation layer</a>) that protects the foil from further <a href="page.php?w=oxidation">oxidation</a>.</p>

<p><big>Stoichiometry</big></p>
<p>Oxides are extraordinarily diverse in terms of <a href="page.php?w=stoichiometries">stoichiometries</a></p><p>
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