Scientists think that the Earth's early atmosphere was made by gases released from volcanoes.
Complete the sentences about how the atmosphere changed.
Use words from the list: carbon dioxide, condensed, evaporated, nitrogen, oceans, oxygen, photosynthesis
The early atmosphere was mainly ...... with some water vapour. As the Earth cooled, the water vapour ...... to form the ...... . Algae and plants evolved. They used ...... to remove carbon dioxide from the atmosphere and make ...... .
The table shows the percentages of some gases in the Earth's atmosphere today.
| Gas | Percentage in the atmosphere (%) |
|---|---|
| nitrogen | ? |
| oxygen | ? |
| argon | 0.9 |
| carbon dioxide | 0.04 |
Complete the table.
Photosynthesis removed carbon dioxide from the early atmosphere.
Give one other way that carbon dioxide was removed from the early atmosphere.
Suggest why scientists cannot be certain about the composition of the Earth's early atmosphere.
51 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.