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How did Earth get its oxygen? Researchers dive for answers in Lake Huron sinkhole.

Doyle Rice, USA TODAY Comments Off on How did Earth get its oxygen? Researchers dive for answers in Lake Huron sinkhole.

We know that the rise of oxygen on Earth was key to the development of all life over the past two billion years. But how did the oxygen get here?

      
Doyle Rice, USA TODAY
http://api-internal.usatoday.com.akadns.net

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