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かいようむさんそじへん 海洋無酸素事変
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Noun
1. Oceanic Anoxic Event; Ocean Anoxic Event; OAE​
Wikipedia definition
2. Anoxic event​Oceanic anoxic events or anoxic events occur when the Earth's oceans become completely depleted of oxygen (O2) below the surface levels. Although anoxic events have not happened for millions of years, the geological record shows that they happened many times in the past. Anoxic events may have caused mass extinctions. These mass extinctions were so characteristic, they include some that geobiologists use as time markers in biostratigraphic dating.
Read “Anoxic event” on English Wikipedia
Read “海洋無酸素事変” on Japanese Wikipedia
Read “Anoxic event” on DBpedia

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