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Mystery of Mass Extinctions Is No Longer Murky

I don't remember seeing this:

The ebb and flow of the sea is the primary cause of the world's mass extinctions over the past 500 million years according to the national Science Foundation article (Press Release 08-103) based on the journal /Nature /report published online June 15, 2008.

http://www.nsf.gov/news/news_summ.jsp?cntn_id=111722&govDel=USNSF_51 //