Question detail
Why is it important to know the percentage composition of gases in the atmosphere?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
The composition and evolution of the Earth's atmosphere
Question
Why is it important to know the percentage composition of gases in the atmosphere?
Answer
Knowing the percentage composition of gases in the atmosphere is important because it helps us understand the conditions for life on Earth, the processes of photosynthesis and respiration, and the impact of human activities on climate change.
Explanation
A strong answer should directly address the approved learning objective to recall that the Earth's atmosphere is about 20 percent oxygen. This question belongs to The proportions of different gases in the atmosphere within The composition and evolution of the Earth's atmosphere, so the response should use that exact curriculum context rather than a generic statement. The answer is correct when it names the key idea, explains the link to atmosphere, and keeps the wording specific to AQA GCSE revision.
Common mistake
Oxygen Proportion Misunderstanding
Students often confuse the percentage of oxygen in the atmosphere with that of nitrogen, thinking it is higher than 20 percent.
Remember that the Earth's atmosphere is about 20 percent oxygen and 80 percent nitrogen. Use mnemonic devices or visual aids to help memorize these proportions.
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