Which gas is not thought to have been added to the atmosphere by extensive volcanic eruptions early in Earth's history?
A) Hydrogen sulfide
B) Nitrogen
C) Sulfur dioxide
D) Carbon dioxide
E) Oxygen

Question

Quizplus · Accepted Answer

Oxygen was not added to the atmosphere by volcanic eruptions early in Earth's history. Instead, it accumulated in the atmosphere much later, primarily due to photosynthesis by early life forms.

Which Gas Is Not Thought to Have Been Added to the Atmosphere