Anoxic event

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Notion

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Science and technology

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What Wikipedia says

An anoxic event describes a period wherein large expanses of Earth's oceans were depleted of dissolved oxygen (O2), creating toxic, euxinic (anoxic and sulfidic) waters. Although anoxic events have not happened for millions of years, the geologic record shows that they happened many times in the past.

Excerpt from the Wikipedia article “Anoxic event”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jgross2atLSU, CC BY-SA 3.0, via Wikimedia Commons.