Question detail
Which of the following statements is true about the early 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. It contained mainly oxygen.
- B. It was formed by photosynthesis.
- C. It contained methane and ammonia.
- D. It was composed solely of nitrogen.
Answer
The correct option is It contained methane and ammonia.. This answer is correct because it matches the approved learning objective to describe possible early atmospheric gases including methane and ammonia in the subtopic The Earth's early atmosphere.
Explanation
The correct option is It contained methane and ammonia.. It contained methane and ammonia. is correct because it directly supports the approved learning objective to describe possible early atmospheric gases including methane and ammonia. 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 Gases
Students often confuse methane and ammonia as being the same gas when describing possible early atmospheric gases.
Remember that methane (CH₄) is a hydrocarbon, while ammonia (NH₃) is a nitrogen compound. Make sure to distinguish between their chemical formulas and properties.
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