Question

which process most likely released gases that formed earths early atmosphere?
photosynthesis by plants
volcanic eruptions from earths interior
collisions with asteroids
condensation of water vapor

Explanation:

To determine the process that released gases forming Earth’s early atmosphere, we analyze each option:

• Photosynthesis by plants: Plants evolved later; early atmosphere formed before photosynthetic organisms. Eliminate this.
• Volcanic eruptions from Earth’s interior: Early Earth had intense volcanic activity, releasing gases (e.g., CO₂, H₂O vapor, N₂) that contributed to the primordial atmosphere. This is consistent with geological and atmospheric formation theories.
• Collisions with asteroids: Asteroids deliver some gases, but the primary atmospheric gases came from Earth’s internal outgassing (volcanism), not asteroids as the main source. Eliminate this.
• Condensation of water vapor: Condensation forms liquid water (oceans), not atmospheric gases. Eliminate this.

Answer:

The option "Volcanic eruptions from Earth’s interior" (the third option in the list).