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9.1 The composition and evolution of the Earth's atmosphere

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Question 3
F

The proportion of nitrogen in the atmosphere increased during the first two billion years of the Earth's existence. Which statement explains this increase?

[1]
A

Nitrogen dissolved in the oceans and was precipitated as sediments

B

Nitrogen was locked up in sedimentary rocks and in fossil fuels

C

Nitrogen was released by volcanoes and is unreactive, so it built up

D

Nitrogen was released by algae and is unreactive, so it built up

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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