Across
- 2. Reaction A process in which substances change into different substances
- 5. The air that surrounds Earth
- 6. To try and make something new that solves a problem
- 7. A group of parts that work together
- 8. To put together multiple pieces of information in order to understand something
- 11. The stuff that things are made of
- 13. A person who uses science knowledge to design something in order to solve a problem
- 14. A group of atoms joined together in a particular way
- 15. Vapor Water in the form of invisible gas
- 17. The solid part of Earth
- 19. When a gas turns into a liquid
- 20. A supply of something that is useful
Down
- 1. When a liquid turns into a gas
- 3. A description of how something works or why something happens
- 4. All the living things on Earth
- 9. Matter that is made of only one kind of atom or molecule
- 10. Water that has been used and now contains harmful substances
- 12. All of the liquid water and ice on Earth
- 16. Things that engineers think about and test in order to know how well something solves a problem
- 18. What you can observe or measure about something that helps you figure out what it is