1. What was the composition of Earth's early atmosphere primarily characterized by?
2. What specific role did volcanic outgassing play in the formation of Earth's oceans?
3. What is the primary role of the carbon dioxide cycle in Earth's environment?
Early atmosphere — main gases?
Primarily CO₂, water vapour, nitrogen, ammonia, methane.
Oceans — formation process?
Condensation of water vapour as Earth cooled.
Carbon cycle — key process?
Exchange of CO₂ among atmosphere, oceans, and rocks.
Early Atmosphere — composition?
Mostly volcanic gases: CO₂, water vapour, nitrogen, ammonia, methane.
Oceans — formed by?
Water vapour condensed into liquid water.
Carbon Cycle — role?
Recycles carbon among atmosphere, oceans, and rocks.
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