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The Earths Early Atmosphere (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'The Earths Early Atmosphere' from the broader topic Chemistry Of The Atmosphere. The test is geared towards the AQA exam board style syllabus.
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Which process is mainly responsible for the large increase in atmospheric oxygen about 2.5 billion years ago?
Which process removed carbon dioxide from the atmosphere and helped form sedimentary carbonate rocks?
What evidence in ancient rocks supports the idea that oxygen levels rose in Earth’s history?
What is the primary source of carbon dioxide in the early atmosphere?
Why is studying the composition of ancient rocks important for understanding Earth’s early atmosphere?
Which factor would have most directly increased greenhouse warming in the early atmosphere?
What role did the formation of the ozone (O3) layer play in Earth’s atmospheric evolution?
Which statement about methane (CH4) in the early atmosphere is correct?
Which of the following best explains why Earth retained a dense atmosphere while smaller bodies lost theirs?
Which of the following gases was NOT a major component of Earth’s early atmosphere soon after formation?
What is thought to have been a key trigger for the Great Oxygenation Event (when O2 accumulated in the atmosphere)?