Across
- 3. difficult, not easy
- 7. very close together with no space
- 8. (with reference to a liquid)reach or cause to reach the temperature at which it bubbles and turns to vapor
- 10. the smaller part of something that cannot be broken down chemically
- 11. for example, air, steam
- 13. a group of atoms joined together
- 14. a round object
Down
- 1. in contact
- 2. not difficult, with no problem
- 4. connected
- 5. a lot of things together in a small space
- 6. a hard substance, for example, ice
- 9. a substance that flows like water or oil
- 12. form, outline
- 13. make or become liquefied by heat