Question detail
What were the main components of the Earth's early atmosphere compared to the present 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
What were the main components of the Earth's early atmosphere compared to the present atmosphere?
Answer
The Earth's early atmosphere was primarily composed of carbon dioxide, with little or no oxygen. In contrast, the present atmosphere is about 80 percent nitrogen and 20 percent oxygen, along with trace amounts of other gases.
Explanation
A strong answer should directly address the approved learning objective to compare the early atmosphere with the present atmosphere. This question belongs to The Earth's early 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 early atmosphere, and keeps the wording specific to AQA GCSE revision.
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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