What were the dominant gases in Earth's earliest atmosphere after it first formed?
A) methane and ammonia
B) hydrogen and helium
C) nitrogen and oxygen
D) carbon dioxide and nitrogen

Question

Quizplus · Accepted Answer

The earliest atmosphere of Earth, right after its formation, was primarily composed of hydrogen and helium, which are the lightest and most abundant elements in the universe. These gases were eventually lost to space due to the planet's low gravity and solar winds, leading to the development of a secondary atmosphere from volcanic outgassing.

What Were the Dominant Gases in Earth's Earliest Atmosphere After