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9.1 The composition and evolution of the Earth's atmosphere

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Question 13

Scientists estimated the mass of carbon locked in two stores in the rocks beneath a region of land.

Carbon storeMaterial in the storeEstimated mass of carbon in billion tonnes
ALimestone360
BCoal90
a.

Calculate how many times greater the mass of carbon in Store A is than the mass of carbon in Store B.

[1]
b.

Explain how carbon that was once in the atmosphere became locked in each store.

[4]
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

79 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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