How did Earth's atmosphere form?

Question

Quizplus · Accepted Answer

Earth's atmosphere formed from volcanic gases. As the Earth's crust cooled, volcanoes released gases such as water vapor, carbon dioxide, nitrogen, and methane. These gases became trapped in the Earth's atmosphere through the process of gravitational attraction. Over time, the composition of the atmosphere changed as photosynthetic bacteria and plants began to release oxygen, and as geological processes continue to affect the atmosphere.

How Did Earth's Atmosphere Form