How do greenhouse gases help keep Earth warm?
They reflect sunlight back towards the Earth's surface
They absorb ultraviolet radiation arriving from the Sun
They absorb infrared radiation given off by the Earth
They react with oxygen in the air, releasing heat
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.