Scientists study 'Snowball Earth'

Canadian scientists have determined the factors involved in ending a severe ice age 750 million years ago that nearly completely froze Earth's oceans.

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<p><a href="http://www.physorg.com/news83960569.html">Scientists study 'Snowball Earth'</a></p> <p>Canadian scientists have determined the factors involved in ending a severe ice age 750 million years ago that nearly completely froze Earth's oceans. </p>