Across
- 2. all the living things on Earth
- 5. all of the liquid water and ice on Earth
- 7. when a liquid turns into a gas
- 11. the air that surrounds Earth
- 13. matter that is made of only one kind of atom or molecule
- 14. the stuff that things are made of
- 15. a group of atoms joined together in a particular way
Down
- 1. a supply of something that is useful
- 3. what you can observe or measure about something that helps you figure out what it is
- 4. reaction a process in which substances change into different substances
- 6. the solid part of Earth
- 8. water that has been used and now contains harmful substances
- 9. when a gas turns into a liquid
- 10. to try to make something new that solves a problem
- 12. vapor water in the form of invisible gas