Question detail
How did carbon dioxide levels in the atmosphere decrease over geological time?
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. By increasing volcanic activity
- B. Through the formation of fossil fuels
- C. By photosynthesis alone
- D. By the release of methane
Answer
The correct option is Through the formation of fossil fuels. This answer is correct because it matches the approved learning objective to explain that some carbon was trapped in fossil fuels formed from dead organisms in the subtopic How carbon dioxide decreased.
Explanation
The correct option is Through the formation of fossil fuels. Through the formation of fossil fuels is correct because it directly supports the approved learning objective to explain that some carbon was trapped in fossil fuels formed from dead organisms. This belongs to the subtopic How carbon dioxide decreased 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 How carbon dioxide decreased.
Common mistake
Misunderstanding Fossil Fuels
Students often confuse fossil fuels with other carbon stores, thinking they are just another form of carbon rather than products formed from dead organisms.
Emphasize that fossil fuels are specifically formed from the remains of ancient plants and animals, and clarify the process of their formation.
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