Question detail
Explain how dissolved carbon dioxide contributes to the formation of carbonate precipitates in the oceans.
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
Explain how dissolved carbon dioxide contributes to the formation of carbonate precipitates in the oceans.
Answer
Dissolved carbon dioxide in ocean water reacts with calcium ions to form calcium carbonate, which precipitates out of solution. This process leads to the formation of carbonate sediments on the ocean floor.
Explanation
A strong answer should directly address the approved learning objective to explain that dissolved carbon dioxide was used to form carbonate precipitates. This question belongs to How carbon dioxide decreased 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 carbon dioxide, and keeps the wording specific to AQA GCSE revision.
Common mistake
Misunderstanding Carbonate Formation
Students often confuse the process of carbon dioxide dissolving in oceans with the formation of carbonate precipitates, thinking they are the same process.
Clarify that dissolved carbon dioxide reacts with other substances in the water to form carbonate precipitates, which is a separate step in the carbon cycle.
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