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Petrologist, Jeffrey C. Alt (left) of the University of Miami and Rolf Emmermann of the University of Geissen in the Federal Republic of Germany, examining basalt in the Core Lab of the D/V Glomar Challenger (ship) during the Deep Sea Drilling Project. 1981.

Petrologist, Jeffrey C. Alt (left) of the University of Miami and Rolf Emmermann of the University of Geissen in the Feder...