Controversial theory proposes that tectonic activity fertilized cyanobacteria.
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References
Campbell, I. H. & Allen, C. M. Nature Geosci. doi: 10.1038/ngeo259 (2008).
Berner, R. A., VandenBrooks, J. M. & Ward, P. D. Science 316, 557–558 (2007).
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Dance, A. Colliding continents may have oxygenated the Earth. Nature (2008). https://doi.org/10.1038/news.2008.974
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DOI: https://doi.org/10.1038/news.2008.974