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<p>the mechanism of thermal transport changes from <a href="page.php?w=Heat_conduction">conduction</a>, as within the rigid tectonic plates, to <a href="page.php?w=convection">convection</a>, in the portion of Earth's mantle that convects. Despite its <a href="page.php?w=solid">solid</a>ity, most of Earth's mantle behaves over long time-scales as a <a href="page.php?w=fluid">fluid</a>, and heat is transported by <a href="page.php?w=advection">advection</a>, or material transport. Second, <a href="page.php?w=Decay_heat">radioactive heat</a> production</p><p>
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