The statements describe how the Earth's atmosphere is thought to have changed over time.
Statement 1: Algae and plants evolved and began to photosynthesise.
Statement 2: Volcanoes released carbon dioxide and water vapour.
Statement 3: The Earth cooled and water vapour condensed to form the oceans.
Statement 4: The percentage of oxygen in the atmosphere increased.
What is the correct order of these events?
2, 1, 3, 4
2, 3, 1, 4
3, 2, 1, 4
2, 3, 4, 1
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.