| Term | Definition |
| matter | Anything that takes up space and has volume and mass. |
| molecule | A Latin word meaning " Little Mass". |
| molecules | Tiny particles that are the smallest part of a solid, liquid, or gas. |
| atoms | The very smallest parts that make up a molecule. |
| solid | Matter that has a definite shape and volume. |
| liquid | Matter that has a definite volume and takes the shape of its container. |
| gas | Matter that changes in both shape and volume. It takes the shape and spreads out to fill the container it is in. |
| plasma | Matter that does not have a definite shape or volume, its molecules are electrically charged. |
| aurora | Highly charged plasma that collides with gas particles at the poles of Earth. |
| space | The state of matter is determined by the _____ between the molecules. |