Billions of years ago, the Earth's early atmosphere contained high levels of water vapour. Over geological time, the proportion of water vapour in the atmosphere decreased significantly.
Explain how this decrease in water vapour occurred.
Practise Edexcel GCSE Chemistry Earth and atmospheric science with exam-style questions for Foundation and Higher tier. 62 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
