Oxygen did not accumulate in the early atmosphere until it reacted with reduced materials, especially ________, in the oceans.
A) hydrogen
B) elemental sulfur
C) ferrous iron
D) nitrate

Question

Quizplus · Accepted Answer

Oxygen did not accumulate in the early atmosphere until it reacted with reduced materials, especially ferrous iron, in the oceans. This process, known as the Great Oxidation Event, began around 2.4 billion years ago and eventually led to the oxygenation of the atmosphere. Hydrogen, elemental sulfur, and nitrate did not play significant roles in this process.

Oxygen Did Not Accumulate in the Early Atmosphere Until It