Across
- 4. It occurs when certain chemicals are brought together.
- 5. A source of salt.
- 6. An oxide of iron produced by the action of water.
- 7. A unit of electrical resistance.
- 9. A common heavy metal
- 11. Very small unit of living matter.
- 13. Functional part of a living body
- 14. Energy, force
- 16. Liquid necessary for most forms of life.
- 18. Men whose field of work is physics.
Down
- 1. Unit of electrical power.
- 2. Scientific work in new fields.
- 3. Carbon monoxide.
- 8. The profession in which we find doctors and nurses, and adjective.
- 9. Where many scientists do their work.
- 10. Do this to extinguish a candle or a small flame
- 12. A new exercise carried out by a scientist.
- 15. Without it, things remain theories.
- 16. Unwanted matter.
- 17. Mr. Nobel created one for physics.