Billions of years ago, Earth's atmosphere was composed primarily of carbon dioxide. What happened to much of this carbon dioxide?

Question

Quizplus · Accepted Answer

The carbon dioxide in Earth's early atmosphere dissolved into the oceans, where it eventually contributed to the formation of carbonate rocks and was used by living organisms in the process of photosynthesis, significantly reducing the amount of CO2 in the atmosphere over time.

Billions of Years Ago, Earth's Atmosphere Was Composed Primarily of Carbon