GEOLOGY

Detailed explanation-1: -Materials that have high resistance to electric current are called electric insulators. Examples include most nonmetallic solids, such as wood, rubber, and plastic. Their atoms hold onto their electrons tightly, so electric current cannot flow freely through them. Dry air is also an electric insulator.

Detailed explanation-2: -Insulators have a much larger gap between the conduction band and the valence band, which makes it difficult for them to conduct electricity, resulting in greater resistance, so insulators offer infinitely high resistance.

Detailed explanation-3: -Insulators are substances that do not allow electricity to pass through them. Therefore, to oppose current, insulators have high resistance.

Detailed explanation-4: -Insulators are bad conductors of electricity. So insulators resist the flow of electrons most.

Detailed explanation-5: -Conductors have electrical resistivity on the order of 10-8 to 10-4 cm whereas insulators have electrical resistivity on the order of 108 to 1018 cm.