| A | B |
|---|
| Atom | A particle which makes up molecules |
| The smallest part of matter | Atom |
| Carbon dioxide | A gas which green plants absorb from the air during photosynthesis |
| Hydrogen and Oxygen | The two atoms which make up water |
| Steam | Hot water vapor |
| Molecule | Smallest piece of a substance that still has the qualities of that substance |
| Vibrate | To move back and forth |
| Water vapor | Water in its state of gas |
| Liquid | Has no shape of its own but takes up a certain amount of space |
| Solid | Has a definite shape and fills a certain amount of space |
| Has molecules that are closest together | Solid |
| Gas | Has no shape and does not fill up a fixed amount of space |
| Has molecules that move the fastest | Gas |
