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9.2 Earth and atmospheric science

9.2 Earth and atmospheric science

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Question 54

Use one of the options below to complete the sentence about the history of the Earth's atmosphere. Over the past 4 billion years, the percentage of nitrogen 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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