How Carbon Dioxide Decreased (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Quizzes
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Practise the questions
10 questions from this quiz
What two types of factors influenced CO2 reduction in Earth's atmosphere?
What two types of factors influenced CO2 reduction in Earth's atmosphere?
Geological and biological
How did the oceans form on early Earth?
How did the oceans form on early Earth?
Water vapour condensed
What happened to CO2 when oceans formed?
What happened to CO2 when oceans formed?
It dissolved in the oceans
What is the chemical formula for limestone?
What is the chemical formula for limestone?
How did carbonate sediments like limestone affect atmospheric CO2?
How did carbonate sediments like limestone affect atmospheric CO2?
Removed it from the atmosphere
What organisms further reduced atmospheric CO2 levels?
What organisms further reduced atmospheric CO2 levels?
Photosynthesising organisms
How long did the processes that reduced CO2 and increased oxygen take?
How long did the processes that reduced CO2 and increased oxygen take?
Billions of years
When did Earth's atmosphere stabilise into its current composition?
When did Earth's atmosphere stabilise into its current composition?
About 200 million years ago
What percentage of nitrogen is in the modern atmosphere?
What percentage of nitrogen is in the modern atmosphere?
78%
What percentage of oxygen is in the modern atmosphere?
What percentage of oxygen is in the modern atmosphere?
21%