The table shows the gases released by a volcano today. Scientists use data like these as evidence about the Earth's early atmosphere.
| Gas | Percentage by volume |
|---|---|
| water vapour | 60 |
| carbon dioxide | 24 |
| nitrogen | 10 |
| sulfur dioxide | 4 |
| other gases | 2 |
Statement 1: The data support the idea that the early atmosphere contained little or no oxygen.
Statement 2: The data prove that the early atmosphere had exactly this composition.
Statement 3: The data support the idea that the early atmosphere contained a lot of carbon dioxide and water vapour.
Which statements are correct?
1 only
1 and 3 only
2 and 3 only
1, 2 and 3
97 exam-style questions on Edexcel GCSE Chemistry 9.2 Earth and atmospheric science, covering 9.2.1 The Earth's early atmosphere, 9.2.2 How the atmosphere evolved, 9.2.3 Chemical test for oxygen, and 9.2.4 The greenhouse effect and climate change. Each one has a worked solution and a mark scheme showing where the marks go.