What is a primary atmosphere?
A) the atmospheres that all planets have today
B) the gas captured during the planet's formation
C) the gas captured after the planet's formation
D) the oxygen and nitrogen in Earth's atmosphere
E) the gas closest to the planet's surface

Question

Quizplus · Accepted Answer

A primary atmosphere refers to the gas that a planet captures directly from the surrounding nebula during its formation, primarily consisting of hydrogen and helium.

What Is a Primary Atmosphere