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Interpreting and interacting with earth systems

Interpreting and interacting with earth systems

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Question 13

Approximately 2.7 billion years ago, oxygen began to appear in the Earth's atmosphere.

Which process was primarily responsible for this increasing concentration of oxygen?

A

Combustion

B

Condensation of water vapour

C

Photosynthesis

D

Volcanic activity

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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