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Iron, copper, and aluminum and all examples of what type of mineral?

Answer 1

Combined minerals.

There are two types of minerals: native and combined. Native minerals are less reactive metal minerals like gold that are found in their free elemental state. Combined ores, on the other hand, are metal minerals that do not occur in their free elemental state. For example, iron occurs as haematite, which is iron combined with oxygen.

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Answer 2

Leo Arens

Iron, copper, and aluminum are all examples of metallic minerals.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.