Question detail
What was the primary gas present in the Earth's early 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 was the primary gas present in the Earth's early atmosphere?
Answer
The primary gas present in the Earth's early atmosphere was carbon dioxide, with little or no oxygen.
Explanation
A strong answer should directly address the approved learning objective to describe the Earth's early atmosphere as probably containing mainly carbon dioxide with little or no oxygen. 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
Misunderstanding Early Atmosphere Composition
Students often state that the Earth's early atmosphere contained mainly oxygen instead of carbon dioxide.
Remember that the Earth's early atmosphere is described as probably containing mainly carbon dioxide with little or no oxygen.
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