Volcanic eruptions that depleted ocean oxygen may have set off the Great Dying

Asphyxiation killed off a lot of marine species 252 million years ago

Siberian Traps

SUFFOCATING SPURTS   Massive eruptions from volcanoes, including those that produced vast lava plains known as the Siberian Traps (shown), warmed the planet and turned the oceans deadly, reducing oxygen in the water to dangerously low levels.

Kirill.uyutnov/Wikimedia Commons (CC BY-SA 4.0)

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