GEOLOGY

Detailed explanation-1: -Glass is a bad conductor or an insulator.

Detailed explanation-2: -Glass is an example of electric insulator because it does not contain free electrons and cannot conduct electricity.

Detailed explanation-3: -Generally, non-metals are not conductors of electricity.

Detailed explanation-4: -Therefore, due to its high resistivity and lack of free electrons, glass is a poor electrical conductor.

Detailed explanation-5: -Metals are good conductor of electricity because they have very large number of free valance electrons whereas glass has no free electrons to conduct electricity. So metals good conductor whereas glass is a bad conductor of electricity.