Combined Science GCSE
Limestone
What Limestone means in Combined Science GCSE, as defined for AQA.
Definition of Limestone
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Reference: AQA
Mostly calcium carbonate, CaCO₃, precipitated or compacted from the shells and skeletons of marine organisms such as corals and molluscs, so it forms in warm shallow seas.
Topics that use Limestone
- How carbon dioxide decreased (AQA GCSE)
Related terms
- Atmospheric evolution
- Biomass and carbon storage
- Carbon stores
- Causes of carbon dioxide decrease
- Causes of oxygen and nitrogen increase
- Changes in atmospheric composition over geological time
- Coal
- Crude oil and natural gas
Using Limestone in the exam
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