Across
- 3. the air that surrounds Earth
- 5. what you can observe or measure about something that helps youfigure out what it is
- 6. matter that is made of only one kind of atom or molecule
- 8. a person who uses science knowledge to design something in order to solve a problem
- 9. a supply of something that is useful
- 10. reaction: a process in which substances change into different
- 12. when a gas turns into a liquid
- 15. the stuff that things are made of
- 16. to try something again using what you learned the last time you tried it
- 18. to try to make something new that solves a problem
- 19. all of the liquid water and ice on Earth
- 20. a group of parts that work together
Down
- 1. a group of atoms joined together in a particular way
- 2. water that has been used and now contains harmful substances
- 4. when a liquid turns into a gas
- 7. the solid part of Earth
- 11. all the living things on Earth
- 13. to put together multiple pieces of information in order to understandsomething
- 14. vapor: water in the form of invisible gas
- 17. a description of how something works or why something happens