How Carbon Dioxide Decreased (AQA GCSE Chemistry): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What two types of factors influenced the reduction of CO₂ in Earth's atmosphere?
What two types of factors influenced the reduction of CO₂ in Earth's atmosphere?
Geological and biological
What played a significant role in reducing atmospheric CO₂?
What played a significant role in reducing atmospheric CO₂?
Formation of oceans
What formed when CO₂ dissolved in the newly formed oceans?
What formed when CO₂ dissolved in the newly formed oceans?
Carbonate sediments like limestone
What is the chemical formula of limestone?
What is the chemical formula of limestone?
What further reduced atmospheric CO₂ levels after ocean formation?
What further reduced atmospheric CO₂ levels after ocean formation?
Photosynthesising organisms
What did plants and algae absorb for photosynthesis?
What did plants and algae absorb for photosynthesis?
Carbon dioxide
Over what timescale did these processes reduce CO₂ and increase oxygen levels?
Over what timescale did these processes reduce CO₂ and increase oxygen levels?
Billions of years
When had the atmosphere stabilised into its current composition?
When had the atmosphere stabilised into its current composition?
About 200 million years ago
What percentage of the modern atmosphere is nitrogen?
What percentage of the modern atmosphere is nitrogen?
78%
What percentage of the modern atmosphere is oxygen?
What percentage of the modern atmosphere is oxygen?
21%