Stages Of The Atmosphere

Question 1

What happened in stage 1 of the early atmosphere

Answer 1

Volcanoes release CO2, water vapour and ammonia
Water vapour condenses and forms oceans as earth cooled

Question 2

What happened in stage 2

Answer 2

O2 increase - photosynthesis
Ammonia decrease - formed N and water vapour with O2
Methane decrease - formed CO2 and water vapour with O2
CO2 decrease - oceans, photosynthesis and rocks

Question 3

What are the 4 main gases in the current atmosphere

Answer 3

Nitrogen
Oxygen
Carbon dioxide
Water vapour