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6.3 Interpreting and interacting with earth systems

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Question 25

An automatic air sampler on a research vessel records the mean concentration of carbon dioxide in the air along the same ocean route.

YearCarbon dioxide concentration (ppm)
2004377
2024421

Scientists estimate the concentration in earlier years. They assume that, before 2004, it rose by the same amount each year as its average yearly rise from 2004 to 2024.

In which year was the concentration 355 ppm?

[1]
A

1994

B

2014

C

1982

D

1974

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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