Volcanic activity in the early history of the Earth is believed to be responsible for much of the CO₂ found in the atmosphere.

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Volcanic activity in the early Earth's history released large amounts of sulfur dioxide gas, which eventually reacted with other gases in the atmosphere to form sulfuric acid aerosols. These aerosols reflect sunlight back into space, causing cooling of the planet, and are believed to be responsible for much of the sulfur found in the atmosphere.

Volcanic Activity in the Early History of the Earth Is