Glacial and interglacial periods

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<blockquote class="wp-embedded-content" data-secret="zMxq2t1VVa"><a href="http://www.kushima.org/?p=69951">Glacial and interglacial periods</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="http://www.kushima.org/?p=69951&#038;embed=true#?secret=zMxq2t1VVa" width="600" height="400" title="&#8220;Glacial and interglacial periods&#8221; &#8212; kushima.org" data-secret="zMxq2t1VVa" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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