Workbook Another gas found in the air today is carbon dioxide. 07.4 Describe how carbon dioxide helps to maintain temperatures on Earth.
[3 marks] 07.5 In what way has the amount of carbon dioxide in the atmosphere changed over the last 100 years? [1 mark] 07.6 Describe one way in which human activity has brought about this change to the amount of carbon dioxide in the atmosphere today.
[2 marks]
Chemistry Practice Exam Paper 2
227841 AQA Higher Tier Combined Science All-in-One_P389_420.indd 419
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6/29/16 12:32 PM