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Interpreting and interacting with earth systems

Interpreting and interacting with earth systems

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Question 23

Which gas increased in concentration in the Earth's atmosphere as a direct result of photosynthesis by early organisms?

A

Carbon dioxide

B

Nitrogen

C

Oxygen

D

Water vapour

Markscheme

Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /Interpreting and interacting with earth systems

32 exam-style questions on OCR GCSE Chemistry Interpreting and interacting with earth systems. Each one has a worked solution and a mark scheme showing where the marks go.

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