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9.2.2 How the atmosphere evolved
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A changing atmosphere

A changing atmosphere

Four-stage process diagram showing early atmospheric gases, ocean formation, carbon dioxide storage in carbonate rocks, and oxygen production by photosynthesis The early atmosphere contained a great deal of water vapour and carbon dioxide, but almost no oxygen. Cooling, ocean formation and the appearance of photosynthetic organisms gradually changed this composition.

9.2.2 How the atmosphere evolved Lesson

  1. GCSE
  2. /Chemistry
  3. /9.2.2 How the atmosphere evolved

Step-by-step lessons on Edexcel GCSE Chemistry 9.2.2 How the atmosphere evolved. Each one builds up to exam-style questions. Nail the core quantitative topics — moles, balancing equations and calculations — early on, since they underpin higher-tier questions across every paper and topic.

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