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9.1 The composition and evolution of the Earth's atmosphere

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Question 10
H

Coal, crude oil and natural gas are fossil fuels. They were formed from the remains of organisms over millions of years.

a.

Describe how coal was formed.

[2]
b.

Describe how crude oil and natural gas were formed.

[2]
c.

Explain how the formation of these fossil fuels changed the composition of the Earth's atmosphere.

[2]
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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