| A | B |
|---|
| EPA | a government agency that monitors air pollution |
| efficiency | using a fuel with the least amount of waste |
| hydro power | energy produced by falling water |
| emission | the discharge from an automobile that contains fumes |
| matter | any substance that takes up space and has weight |
| energy | the ability to do work |
| work | to move or change something |
| kinetic energy | energy possessed by an object in motion |
| mechanical energy | the total energy of an object |
| force | a push of pull on an object |
| heat | energy produced by the movement of atoms |
| conduction | the way in which heat energy is passed from one object to another |
| convection | the movement of liquids and gases from a warm spot to a cooler spot |
| radiaton | the movement of heat energy in a direct line away fom hot objects |
| conductors | objects that let flow through them easily |
| insulators | objects that do not let flow through them easily |
| air pollution | dirty air |
| smog | a haze formed when automobile exhaust combines with moisture |
| pesticides | chemicals used to kill insects and weeds |
| toxic waste | poisonous waste from factories and other businesses |
| insecticide | an substance used to kill unwanted insects |
| natural resources | things found in nature that people use |
| renewable resources | natural resources that can renew in a short time |
| nonrenewable resources | resources that are replaced very slowly or not at all |
| conservaton | the protection of Earth's natural balance and wise use |
| nutrients | materials that plants need to grow |
