The pie chart shows the percentages of the three most abundant gases in the Earth's atmosphere today - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1
Question 2
The pie chart shows the percentages of the three most abundant gases in the Earth's atmosphere today.
What is the percentage of oxygen in the atmosphere?
Put a cro... show full transcript
Worked Solution & Example Answer:The pie chart shows the percentages of the three most abundant gases in the Earth's atmosphere today - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1
Step 1
What is the percentage of oxygen in the atmosphere?
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Answer
The percentage of oxygen in the atmosphere is 21%. Therefore, I would put a cross (X) next to option C.
Step 2
Which of the following caused the amount of oxygen to increase?
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Answer
The process that caused the amount of oxygen to increase in the Earth's early atmosphere is photosynthesis in plants. Thus, I would put a cross (X) next to option B.
