Across
- 2. Smallest unit of matter
- 5. Greek letter, symbol for wavelength (6)
- 11. Electromagnetic radiation from space (6,3)
- 12. Huge floating blocks of solid H2 O (8)
- 14. Traditional name for the acid in vinegar (6)
- 15. Instrument for measuring atmospheric moisture (10)
- 16. Unit of power
- 17. Ovum or female gamete
- 18. Electrical device that converts alternating current to direct current
- 19. Device used to measure voltage
Down
- 1. The region of the atmosphere from about 7 km to 16 km above the Earth’s surface (12)
- 3. Compound formed by the reaction of an organic acid and an alcohol (5)
- 4. Crystalline carbon
- 5. Electrical discharge from clouds to Earth (9)
- 6. Scientists who study stars (11)
- 7. Sodium chloride from the earth
- 8. Material that allows electric current to pass through it
- 9. Form of water above its boiling point
- 10. which was the first antibiotic
- 13. Device that converts chemical energy to electrical energy
- 15. the red colour of human blood is due to