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Earth and atmospheric science

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Question 36

Oxygen is a vital atmospheric gas that supports life on Earth.

Various biological and chemical processes continually alter the level of oxygen in the atmosphere.

Draw one straight line from each change in the amount of atmospheric oxygen to the process causing the change.

change in the amount of atmospheric oxygen

  • increase
  • decrease

process causing the change

  • photosynthesis by marine phytoplankton
  • aerobic respiration by soil decomposers
  • cracking of long-chain alkanes
  • crystallization of sodium chloride from brine
  • melting of glaciers due to global warming
[2]

Earth and atmospheric science Questions

  1. GCSE
  2. /Chemistry
  3. /Earth and atmospheric science

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.

Question bank