Earth is comprised of four systems, or spheres. give one example of how a change in one of these spheres of the earth can affect one or more of the other spheres.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called

its temperature is increasing. this causes molecular vibrations to increase.