During the first billion years of the Earth's existence, intense volcanic activity released gases that formed the early atmosphere.
Which gas is believed to have made up the largest percentage of this early atmosphere?
Oxygen
Carbon dioxide
Nitrogen
Argon
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.
