How Carbon Dioxide Decreased (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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How Carbon Dioxide Decreased
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What condensed to form oceans

Water vapour

What dissolved in the oceans

Carbon dioxide

Sediments formed from dissolved CO2CO_2

Carbonate sediments

Example of carbonate sediment

Limestone

Chemical formula of limestone

CaCO3CaCO_3

Effect of carbonate sediments on CO2CO_2

Removed it from atmosphere

Organisms that reduced CO2CO_2 levels

Photosynthesising organisms

How plants/algae reduced CO2CO_2

Absorbed it for photosynthesis

Timescale for CO2CO_2 reduction

Billions of years

When atmosphere stabilised

200 million years ago

% nitrogen in modern atmosphere

78%

% oxygen in modern atmosphere

21%

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Revision Notes by Topics

Formation of Earth's Atmosphere

CO2 & CH4 as Greenhouse Gases

Causes of Atmospheric Pollution

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Model Answers by Topics

Formation of Earth's Atmosphere

CO2 & CH4 as Greenhouse Gases

Causes of Atmospheric Pollution

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Quizzes by Topics

Formation of Earth's Atmosphere

CO2 & CH4 as Greenhouse Gases

Causes of Atmospheric Pollution

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Exam Questions by Topics

Formation of Earth's Atmosphere

CO2 & CH4 as Greenhouse Gases

Causes of Atmospheric Pollution

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