Across
- 2. Instrument used to observe distant stars
- 4. The part of the eye that controls the amount of light entering
- 7. Device used to measure electric current
- 9. The gas essential for combustion
- 10. Gas used in balloons to make them float
- 11. Instrument used to measure temperature
- 12. Process of changing water vapor into liquid
- 13. Device used to split white light into its spectrum
- 15. The speed of light is approximately ___ × 10⁸ m/s
- 16. The planet known as the “Red Planet”
- 20. Scientist who discovered gravity
- 23. Energy stored in an object due to its position
- 24. Liquid part of blood
Down
- 1. The process by which plants make their food using sunlight
- 3. Scientist who proposed the laws of motion
- 5. The phenomenon responsible for the formation of a rainbow
- 6. The chemical process of burning
- 8. The study of heredity and genes
- 14. The powerhouse of the cell
- 17. Chemical symbol of gold
- 18. The unit of force
- 19. The hardest natural substance on Earth
- 20. The center of an atom
- 21. Organ where photosynthesis mainly occurs
- 22. The smallest particle of an element