What is produced by the movement of electrons?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

In which of these cases are the two wave points considered to be in phase with each other?

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage