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9.1 The composition and evolution of the Earth's atmosphere

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Question 2
F

During the first billion years of the Earth's existence there was intense volcanic activity. One theory suggests that the gases released by the volcanoes formed the Earth's early atmosphere.

Figure: The gases released by intense volcanic activity into the Earth's early atmosphere

image

a.

Use the figure. Name the gas that made up most of the Earth's early atmosphere.

[1]
b.

The volcanoes also released water vapour. Name the process by which this water vapour formed the oceans.

[1]
c.

The Earth's early atmosphere contained little or no oxygen. Give one piece of evidence from the Solar System today that supports this.

[1]
d.

Explain why scientists cannot be certain about the composition of the Earth's early 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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