Report: Hot Rocks Keep N. America Afloat

(AP) -- If it weren't for the hot rocks down below Earth's crust, most of North America would be below sea level, report researchers who say the significance of Earth's internal heat has been overlooked.

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<p><a href="http://www.physorg.com/news102094316.html">Report: Hot Rocks Keep N. America Afloat</a></p> <p>(AP) -- If it weren't for the hot rocks down below Earth's crust, most of North America would be below sea level, report researchers who say the significance of Earth's internal heat has been overlooked.</p>