How Carbon Dioxide Decreased (AQA GCSE Chemistry Combined Science): Quizzes

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How Carbon Dioxide Decreased
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How did ocean formation help reduce atmospheric CO2CO₂?

CO2CO₂ dissolved in the oceans

What formed when CO2CO₂ dissolved in the oceans?

Carbonate sediments

Which sediment formed from dissolved CO2CO₂ in oceans?

Limestone

What is the chemical formula for limestone?

CaCO3CaCO₃

What organisms further reduced atmospheric CO2CO₂ levels?

Photosynthesising organisms

What did plants and algae absorb for photosynthesis?

Carbon dioxide

How long did the processes that reduced CO2CO₂ take?

Billions of years

When had the atmosphere stabilised to its current composition?

200 million years ago

What percentage of nitrogen is in the modern atmosphere?

78%

What percentage of oxygen is in the modern atmosphere?

21%

Explore AQA GCSE Chemistry Combined Science Revision Notes by Topics

Formation of Earth's Atmosphere

CO2 & CH4 as Greenhouse Gases

Causes of Atmospheric Pollution

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Formation of Earth's Atmosphere

CO2 & CH4 as Greenhouse Gases

Causes of Atmospheric Pollution

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Formation of Earth's Atmosphere

CO2 & CH4 as Greenhouse Gases

Causes of Atmospheric Pollution

Explore AQA GCSE Chemistry Combined Science Exam Questions by Topics

Formation of Earth's Atmosphere

CO2 & CH4 as Greenhouse Gases

Causes of Atmospheric Pollution

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