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The Earth’s atmosphere has changed during the last 4.6 billion years.
0 1 . 1 What is the approximate percentage of nitrogen and of oxygen in the
Earth’s atmosphere today?
Draw one line from each gas to the percentage of that gas.
[2 marks]
0 1 . 2 The approximate percentage of carbon dioxide in the Earth’s early atmosphere
was 95%.
Which are two reasons why the percentage of carbon dioxide has decreased since
the Earth’s early atmosphere?
[2 marks]
Tick () two boxes.
Combustion of fuels
Deforestation
Dissolving in oceans
Photosynthesis
Respiration 

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