Question detail
Which of the following statements about the early atmosphere is true?
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. It contained high levels of oxygen.
- B. It was formed primarily from gases released by plants.
- C. It was mainly composed of carbon dioxide.
- D. It had a similar composition to today's atmosphere.
Answer
The correct option is It was mainly composed of carbon dioxide.. This answer is correct because it matches the approved learning objective to explain that volcanic activity released gases that formed the early atmosphere in the subtopic The Earth's early atmosphere.
Explanation
The correct option is It was mainly composed of carbon dioxide.. It was mainly composed of carbon dioxide. is correct because it directly supports the approved learning objective to explain that volcanic activity released gases that formed the early 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
Volcanic Gas Misconception
Students often think that volcanic activity only released carbon dioxide and did not consider other gases.
Remember that volcanic activity released a variety of gases, including water vapour and nitrogen, in addition to carbon dioxide.
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