An international team of ocean, Earth and marine scientists has found evidence supporting a theory that a certain oxygen isotope ratio in seawater has changed slowly over the past 540 million years. In their study, published in the Proceedings of the National Academy of Sciences, the group analyzed rocks from the Ordovician period.
New evidence supports theory that oxygen isotope ratio in seawater slowly increased over last 540 million years retrieved 2 September 2024 from https://phys.org/news/2024-09-evidence-theory-oxygen-isotope-ratio.html
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