Whats the difference between bad conductors , insulators and dielectric

Insulators does not allow flow of electric charges at all.
bad conductors are those which can conduct electricity but offers more opposition (resistence) to the flow of current compared to the flow of current in a good conductor.
all dielectrics are insulators, but all insulators are not dielectric.

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By dividing you can find the answer

The earths atmosphere is made up of nitrogen and oxygensolids turning into gases is called sublimation.