Carbon dioxide and methane — Difficult
Transfer your understanding to a changed context, justify decisions and check your reasoning. No hints during the test.
Includes extension practice
Greenhouse gases and CO₂ sources overlap; photosynthesis and broader climate-energy analysis extend the named outcomes, while some fuel content is cross-topic.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- igcse-cambridge-cie-0652 2025–2026 · C10.3; C10.2; C12.2
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