What is a major source of sulfur dioxide (SO2\text{SO}_2SO2) in the Earth's atmosphere?
The combustion of sulfur-containing impurities in fossil fuels.
The incomplete combustion of hydrocarbons in car engines.
The reaction of nitrogen and oxygen at high temperatures in car engines.
The decay of organic matter in landfills.
32 exam-style questions on OCR GCSE Chemistry Interpreting and interacting with earth systems. Each one has a worked solution and a mark scheme showing where the marks go.