Question detail
Which gas is present in small proportions in today's atmosphere?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The composition and evolution of the Earth's atmosphere
Question
- A. Nitrogen
- B. Oxygen
- C. Carbon dioxide
- D. All of the above
Answer
The correct option is All of the above. This answer is correct because it matches the approved learning objective to compare the early atmosphere with the present atmosphere in the subtopic The Earth's early atmosphere.
Explanation
The correct option is All of the above. All of the above is correct because it directly supports the approved learning objective to compare the early atmosphere with the present atmosphere. This belongs to the subtopic The Earth's early atmosphere within The composition and evolution of the Earth's atmosphere, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from The Earth's early atmosphere.
Common mistake
Confusing Early and Present Atmosphere
Students often confuse the composition of the Earth's early atmosphere with that of the present atmosphere, thinking they are similar.
Do not treat this as a general statement about early atmosphere. Instead, answer by clearly linking the correction to compare the early atmosphere with the present atmosphere in The Earth's early atmosphere. This keeps the response inside The composition and evolution of the Earth's atmosphere and prevents a vague or off-topic GCSE answer. The mistake to avoid is: students often confuse the composition of the Earth's early atmosphere with that of the present atmosphere, thinking they are similar.
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