Earth's internal heat - Understanding Global Change

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<blockquote class="wp-embedded-content" data-secret="q5ruoywYSh"><a href="https://ugc.berkeley.edu/background-content/earths-internal-heat/">Earth&#8217;s internal heat</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://ugc.berkeley.edu/background-content/earths-internal-heat/embed/#?secret=q5ruoywYSh" width="600" height="400" title="&#8220;Earth&#8217;s internal heat&#8221; &#8212; Understanding Global Change" data-secret="q5ruoywYSh" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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