Across
- 4. The smallest unit of matter.
- 8. The process of a liquid changing into a gas.
- 10. A community of living organisms and their non-living environment.
- 12. A substance made up of two or more elements chemically combined.
- 13. The basic unit of life.
- 14. A pure substance made up of only one type of atom.
Down
- 1. A combination of substances that are not chemically combined.
- 2. The process by which plants use sunlight to create food.
- 3. A force that opposes motion between two surfaces.
- 5. The ability to do work.
- 6. The force that attracts objects towards the Earth.
- 7. The process of soil being worn away by wind or water.
- 9. A push or pull on an object.
- 11. A complete path for electric current to flow through.
- 13. reaction: A process where one substance changes into another.