How the World Works

3. changing from a gas to liquid
5. two or more things mixed together
9. liquid turns into a gas
12. impossible to reverse, turn back or change
13. process in which one thing spreads evenly through another
14. things that cannot be separated into simpler substances using chemistry, like gold and oxygen
16. a form that quickly spreads out when it is warmed and contracts when cooled
17. energy a type of energy that makes things warmer
19. a form that flows easily and is not a solid or a gas
20. an experiment or test that are done to limit mistakes or influence by other factors

1. of the material world
2. the science that studies the form and function of basic elements and their compounds
4. something that can change
5. all things that have atoms and take up space
6. controlled by how something else turns out
7. test a test that controls everything but one variable
8. separate or without connection
10. having parts very close together with little space between
11. able to be corrected or reversed
15. of matter any material can exist in either sold, liquid or gas
18. having a firm shape or form that can be measured in length, width and height