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A mineral that contains a useful substance or element, such as iron or aluminum, is a(n): a. vein mineral c. ore b. gem d. geode

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Answer: C - ore

Explanation:

the definition of ore is: a naturally occurring solid material from which a metal or valuable mineral can be profitably extracted

a gem is something like a ruby (not iron or aluminum), a geode is a cavity in rocks, and a vein mineral is a layer of war in between rocks

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