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9.2 Earth and atmospheric science

9.2 Earth and atmospheric science

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Question 45

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]
Markscheme

9.2 Earth and atmospheric science Questions

  1. GCSE
  2. /Chemistry
  3. /9.2 Earth and atmospheric science

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.

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