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6.3 Interpreting and interacting with earth systems

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Question 10

A geochemist is reconstructing how oxygen first began to accumulate in the atmosphere. Four process cards are shown in a mixed order.

P. Oxygen escaped into the air and its percentage gradually rose.

Q. The dissolved iron compounds in the oceans were used up.

R. Algae and bacteria living in the oceans began to photosynthesise.

S. Most of the oxygen reacted with dissolved iron compounds in the oceans.

Which option gives the correct order of these processes?

[1]
A

R, P, S, Q

B

R, S, P, Q

C

R, S, Q, P

D

S, R, Q, P

Markscheme

6.3 Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /6.3 Interpreting and interacting with earth systems

109 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.

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