Across
- 4. The force that pulls objects toward Earth.
- 6. A measure of how hot or cold something is.
- 7. A group of atoms joined together.
- 8. Living things interacting with their environment.
- 11. The study of life.
- 12. A basic substance made of one type of atom.
- 14. The study of matter and energy.
- 15. A mixture where one substance dissolves in another.
Down
- 1. A group of similar living organisms.
- 2. A test done to learn something new.
- 3. A trait helping a living thing survive.
- 5. A substance used in or produced by reactions.
- 9. A living thing.
- 10. The ability to do work.
- 13. A change that happens when substances combine.