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<a accesskey="3" href="page.php?w=Ecosphere_%28planetary%29&amp;p=2">3.Next</a>
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<p>An <b>ecosphere</b> is a <a href="page.php?w=closed_ecological_system">closed ecological system</a> for a planet. In this global <a href="page.php?w=ecosystem">ecosystem</a>, the various forms of energy and matter that constitute a given <a href="page.php?w=planet">planet</a> interact on a continual basis. The forces of the four <a href="page.php?w=Fundamental_interaction">Fundamental interaction</a>s cause the various forms of matter to settle into identifiable layers. These layers are referred to as component spheres with the type and extent</p><p>
<a accesskey="3" href="page.php?w=Ecosphere_%28planetary%29&amp;p=2">3.Next</a>
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