Which gases are pumped into the atmosphere by extreme, sustained volcanism?

Answer

Carbon dioxide ($ ext{CO}_2$) and sulfur dioxide ($ ext{SO}_2$)

Massive flood basalt eruptions pump enormous volumes of greenhouse gases, specifically carbon dioxide ($ ext{CO}_2$), and sulfur dioxide ($ ext{SO}_2$), into the atmosphere.

Which gases are pumped into the atmosphere by extreme, sustained volcanism?
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