What event led to the mass extinction that occurred 260 million years ago?

1 Answer
Alan P.
Mar 18, 2017

A massive volcanic eruption.

Explanation:

This probably a reference to the Permian-Triassic Extinction.

Volcanic eruption
#rarr# increased #CO_2# in atmosphere
#color(white)("XX")rarr# increased methane production by bacteria
#color(white)("XXXX")rarr# Earth warming
#color(white)("XXXX")rarr# acidic oceans

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