| A | B |
|---|
| gravity | The force that pulls things toward the center of the earth |
| laser | A device that makes a very narrow but strong beam of light |
| sonar | An instrument that sends out waves to locate objects uner the water |
| electricity | One of the basic forms of energy |
| camera | A device for taking photographs or motion pictures |
| combine | To join together |
| telephone | A system or instrument used to send sound over a long distance |
| automobile | A vehicle that usually has four wheels and is powered by an engine that uses gasoline |
| transistor | A very small electronic device that controls the electronic current in television sets and other equipment |
| microchip | A small, thin slice of special material that usually contains a large number of tiny electronic parts |
| airplane | A machine with wings the flies |
| television | A large system for sending and receiving pictures and sound over long distances by means of electricity |
| skyscraper | A very tall building |
| microscope | A device that is used to look at things that are too small to be seen with the naked eye |
| radar | A device used to find and track objects |
| antibiotics | More then one drug that is used in medicine to kill or slow the growth of germs that cause disease |
| submarine | A ship that can travel under water |
| helicopter | An aircraft that is kept in the air by blades that rotate above the craft |
| refrigeration | A process of keeping something cool |
| stethoscope | An instrument used to listen to heart-beats and other sounds in the body |
