How carbon dioxide decreased

Chemistry (Combined Science) · GCSE · AQA · AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Foundation · Specification point · 5.9.1.4 · Chemistry of the atmosphere · The composition and evolution of the Earth's atmosphere

Fossil fuel formation as a carbon store

Limestone formation as a carbon store

Photosynthesis and atmospheric carbon dioxide

Changes in Earth's atmospheric composition

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5.9.1.4 How carbon dioxide decreased

Content	Key opportunities for skills development
$Algae and plants decreased the percentage of carbon dioxide in the atmosphere by photosynthesis. Carbon dioxide was also decreased by the formation of sedimentary rocks and fossil fuels that contain carbon.$
$Students should be able to: describe the main changes in the atmosphere over time and some of the likely causes of these changes describe and explain the formation of deposits of limestone, coal, crude oil and natural gas.$	$WS 1.2, 4.1$

How carbon dioxide decreased (5.9.1.4) | AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Foundation | KnowledgeSet