Geologists: Opening of passage may be tied to Antarctic cooling

Ancient fish teeth are yielding clues about when Antarctica became the icy continent it is today, highlighting how ocean currents affect climate change.

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<p><a href="http://www.physorg.com/news64858006.html">Geologists: Opening of passage may be tied to Antarctic cooling</a></p> <p>Ancient fish teeth are yielding clues about when Antarctica became the icy continent it is today, highlighting how ocean currents affect climate change.</p>