Question detail
Why are new copper extraction methods needed?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Using the Earth's resources and obtaining potable water
Question
- A. High-grade copper ores are becoming scarce
- B. Copper is no longer used in industry
- C. All copper ores are now low-grade
- D. Copper extraction is too expensive
Answer
The correct option is High-grade copper ores are becoming scarce. This answer is correct because it matches the approved learning objective to explain why new copper extraction methods are needed as high-grade copper ores become scarce. (HT only) in the subtopic Alternative methods of extracting metals.
Explanation
The correct option is High-grade copper ores are becoming scarce. High-grade copper ores are becoming scarce is correct because it directly supports the approved learning objective to explain why new copper extraction methods are needed as high-grade copper ores become scarce. (HT only). This belongs to the subtopic Alternative methods of extracting metals within Using the Earth's resources and obtaining potable water, 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 Alternative methods of extracting metals.
Common mistake
Misunderstanding Scarcity
Students often think that high-grade copper ores are completely depleted, rather than understanding that they are becoming scarce.
Emphasize that high-grade copper ores are still available but in limited quantities, necessitating the development of new extraction methods.
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