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Mass Extinction Events
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Permian-Triassic Extinction
Time Period: 252 million years ago; Causes: Volcanism, methane release from sea floor, and climate change
Triassic-Jurassic Extinction
Time Period: 201 million years ago; Causes: Volcanism leading to climate change, ocean acidification, and asteroid impact
Ordovician-Silurian Extinction
Time Period: 443 million years ago; Causes: Glaciation, sea level change, and possibly gamma-ray burst
Late Devonian Extinction
Time Period: 375-360 million years ago; Causes: Anoxic water conditions, asteroid impacts, and plant colonization of land
Cretaceous-Paleogene Extinction
Time Period: 66 million years ago; Causes: Asteroid impact, volcanic activity, and climate change
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