Question

what is one theory for how earths early (and more permanent) atmosphere formed?
○ earths early atmosphere formed from the evaporation of water from the surface of the early oceans.
○ earths early atmosphere formed from the outgassing of water vapor, carbon dioxide, hydrogen, and other gases from the earths interior.
○ earths early atmosphere formed from the gravitational attraction of gases to the earths surface that were blown off of planets closer to the sun by the solar wind.
○ none of the above.

Explanation:

One theory of Earth's early atmosphere formation is outgassing. Volcanic activity released water vapor, carbon - dioxide, hydrogen, and other gases from the Earth's interior, contributing to the atmosphere. Evaporation of ocean water mainly contributes to the water - cycle in the existing atmosphere, not its initial formation. The idea of gases from closer planets being attracted by Earth's gravity is not a widely - accepted theory for the formation of Earth's early atmosphere.

Answer:

Earth's early atmosphere formed from the outgassing of water vapor, carbon dioxide, hydrogen, and other gases from the earth's interior.