* Mosaic, Potash Corp sink after Russia quits top potash cartel * Pfizer earnings, Aetna profit beat expectations * Sprint reports wider loss but revenue rises; stock up 3 pct * Dow up 0.1 pct, S&P 500 up 0.2 pct, Nasdaq up 0.7 pct By Alison Griswold NEW YORK, July 30 (Reuters) - The S&P 500 rose on Tuesday after earnings from Pfizer and others supported the market, but Mosaic and other potash producers ...
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