A sharp boundary in Earth's layers

A team led by a Brown University student shows a sharp boundary exists between the Earth's hard outermost shell and its more pliable layer beneath.

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<p><a href="http://www.physorg.com/news5521.html">A sharp boundary in Earth's layers</a></p> <p>A team led by a Brown University student shows a sharp boundary exists between the Earth's hard outermost shell and its more pliable layer beneath. </p>