Question detail
What are the major gases in the Earth's atmosphere, and how do they differ from trace gases?
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
What are the major gases in the Earth's atmosphere, and how do they differ from trace gases?
Answer
The major gases in the Earth's atmosphere are nitrogen (about 80%) and oxygen (about 20%). Trace gases include carbon dioxide, water vapour, and noble gases, which are present in much smaller proportions compared to nitrogen and oxygen.
Explanation
A strong answer should directly address the approved learning objective to distinguish the major gases in the present atmosphere from trace atmospheric gases. 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
Confusing Major and Trace Gases
Students often confuse major gases like nitrogen and oxygen with trace gases such as carbon dioxide and noble gases.
To fix this, students should memorize the major gases in the atmosphere and understand that trace gases are present in much smaller amounts.
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