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The top documents tagged [presence of free oxygen]
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PRECAMBRIAN MANGANESE DEPOSITS: GEOLOGICAL SETTING, METALLOGENESIS AND PALEOENVIRONMENTAL IMPLICATIONS NIC BEUKES AND JENS GUTZMER * Paleoproterozoic Mineralization
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Revelation of nature. Your brain sends messages at the rate of 240 mph. There are 10 million nerve cells in your brain. One square inch of skin on the
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