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9.1 The composition and evolution of the Earth's atmosphere

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Question 6
F

Which of these decreased the percentage of carbon dioxide in the Earth's atmosphere?

[1]
A

The evolution of animals that respire aerobically

B

The intense volcanic activity of the first billion years

C

The build-up of the nitrogen released by volcanoes

D

The formation of sedimentary rocks and of fossil fuels

Markscheme

9.1 The composition and evolution of the Earth's atmosphere Questions

  1. GCSE
  2. /Chemistry
  3. /9.1 The composition and evolution of the Earth's atmosphere

40 exam-style questions on AQA GCSE Chemistry 9.1 The composition and evolution of the Earth's atmosphere, covering 9.1.1 The proportions of different gases in the atmosphere, 9.1.2 The Earth's early atmosphere, 9.1.3 How oxygen increased, and 9.1.4 How carbon dioxide decreased. Each one has a worked solution and a mark scheme showing where the marks go.

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