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9.2 Earth and atmospheric science

9.2 Earth and atmospheric science

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Question 40

Use one of the options below to complete the sentence about the Earth's early atmosphere. Over the past 4 billion years, the percentage of carbon dioxide in the Earth's atmosphere has ____________.

  • decreased
  • increased
  • stayed the same
[1]
Markscheme

9.2 Earth and atmospheric science Questions

  1. GCSE
  2. /Chemistry
  3. /9.2 Earth and atmospheric science

97 exam-style questions on Edexcel GCSE Chemistry 9.2 Earth and atmospheric science, covering 9.2.1 The Earth's early atmosphere, 9.2.2 How the atmosphere evolved, 9.2.3 Chemical test for oxygen, and 9.2.4 The greenhouse effect and climate change. Each one has a worked solution and a mark scheme showing where the marks go.

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