1. Evolution of the Atmosphere Question
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Higher Tier
Walking Talking Mark
GCSE Chemistry (Legacy Specification)
Evolution of the Atmosphere Question
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2. Question – Evolution of the atmosphere
The Earth’s atmosphere has changed over the last 4 billion years. There are 3 distinct phases in the evolution of the atmosphere.
QWC: Describe these 3 phases and explain why the amount of atmospheric carbon dioxide has increased in the last 200 years.
(9 marks)

3. Answer – Evolution of the atmosphere
Phase 1: During the first billion years of the Earth’s existence there was a great deal volcanic activity. This activity released the gases that formed the early atmosphere of mainly carbon dioxide and water vapour. The water vapour then condensed to form the oceans.
Phase 2: Green plants evolved all over the Earth and as they photosynthesised they removed carbon dioxide from the atmosphere and produced oxygen. Phase 3: As the oxygen increased the ozone layer formed and more complex organisms evolved. The carbon dioxide in the air has increased because more fossils fuels have been burned in industry and homes and the carbon that was locked up in the fuels has reacted with the oxygen during burning.