Early atmosphere — main gases?
Primarily CO₂, water vapour, nitrogen, ammonia, methane.
Early Atmosphere — composition?
Mostly volcanic gases: CO₂, water vapour, nitrogen, ammonia, methane.
Oceans — formation process?
Condensation of water vapour as Earth cooled.
Oceans — formed by?
Water vapour condensed into liquid water.
Carbon cycle — key process?
Exchange of CO₂ among atmosphere, oceans, and rocks.
Carbon Cycle — role?
Recycles carbon among atmosphere, oceans, and rocks.
Photosynthesis — impact?
Produced oxygen, reduced atmospheric CO₂.
Fossil Fuels — formation?
From dead plants and marine organisms over millions of years.
Oxygen Rise — when?
About 2.4 billion years ago, after photosynthesis evolved.
Human Impact — effect on CO₂?
Significant increase from burning fossil fuels.
Test your knowledge with 9 questions on Earth's Atmospheric Evolution and Human Impact.
1. What was the composition of Earth's early atmosphere primarily characterized by?
2. Approximately how old is Earth's early atmosphere formation event?
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