Nearly all branches of natural science have contributed to understanding of the main events of Earth's past, characterized by constant geological change and biological evolution. The geological time ...
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Portal to the past: Geologist identifies metamorphic rock as a crucial feature of the ancient Earth's carbon cycleDuring the Proterozoic Eon ... the air—during the Proterozoic Eon would have yielded an atmospheric carbon concentration four times higher than modern geologic off-gassing rates seen before ...
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