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

Q: Compounds containing an atom of nitrogen element, bonded in a hydrocarbon framework, are classified as amines.

A: Compounds containing an atom of what element, bonded in a hydrocarbon framework, are classified as amines?
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Q: Zinc is active transition metal kind of metal.

A: Zinc is what kind of metal.?
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Q: There is very little direct sunlight on cloudy days is it more difficult to see your shadow on a cloudy day than on a sunny day.

A:
Why is it more difficult to see your shadow on a cloudy day than on a sunny day?
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