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9.1 The composition and evolution of the Earth's atmosphere

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Question 4
F

Theories about the Earth's early atmosphere have changed and developed over time. The figure shows how two different theories, Theory A and Theory B, describe the percentage of carbon dioxide in the Earth's atmosphere.

Figure: Two theories for the percentage of carbon dioxide in the Earth's atmosphere over the last 4.5 billion years

image

a.

Use the figure. Give one way in which Theory A and Theory B agree.

[1]
b.

Use the figure. Give one way in which Theory A and Theory B disagree.

[1]
c.

Evidence suggests that the Earth's early atmosphere was similar to the atmospheres of Mars and Venus today. Evaluate which of the two theories is better supported by this evidence.

[3]
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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