Which of the following was not a component of Earth's early atmosphere?
A) Hydrogen gas
B) Ammonia
C) Water vapor
D) Oxygen
E) Methane gas

Question

Quizplus · Accepted Answer

Oxygen was not a component of Earth's early atmosphere. The early atmosphere was mainly composed of hydrogen gas, methane gas, ammonia, and water vapor. Oxygen did not become a significant component of the atmosphere until after the evolution of photosynthetic organisms.

Which of the Following Was Not a Component of Earth's