Although the average concentration of carbon dioxide in the Earth's atmosphere is rising overall, the actual concentration fluctuates throughout the year.
Explain two factors that cause the concentration of carbon dioxide in the atmosphere to vary over the course of a year.
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.