Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: Zinc is active transition metal kind of metal.

A: Zinc is what kind of metal.?
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Q: One of the properties of an air mass is that an air mass has similar temperature and moisture properties throughout it.

A: Which of the following is true regarding the properties of an air mass?
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Q: Compounds like sodium chloride form structures called crystals.

A:
Compounds like sodium chloride form structures called what?
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