| A | B |
|---|
| galaxy | a group of millions of stars |
| rock cycle | a continous process of rocks changing into other rocks |
| carbon cycle | cycle in which producers use carbon dioxide and produce oxygen and animals and other living things use oxygen and produce carbon dioxide |
| food chain | The path of energy transfer from one organism to another in an ecosystem. |
| hibernation | a deep sleeplike state when an animal's body process slows down |
| vibration | rapid movement of an object to create sound |
| big bang theory | the theory of how the universe was created |
| condensation | the process of changing a gas to a liquid |
| revolution | an object that completes one turn around another object |
| hot plate | A device used to heat liquids slowly and safely. |
| satellite | a natural or artificial object in space that goes around another object |
| orbit | tThe path that one object in space takes around another object in space. |
| environment | an organism's surroundings |
| pupa | The stage in a life cycle between the larva and the adult. |
| gas | State of matter that has no definite volume and no definite shape. |
