Across
- 3. A material that allows electricity to pass through it.
- 5. The phenomenon of light being reflected from a surface.
- 8. A liquid essential for life.
- 11. The main organ of the human nervous system.
- 13. A type of energy produced by electrical current.
- 14. The process of water being absorbed into the ground.
- 15. Animals that have a backbone.
- 17. The process by which plants produce food using light.
- 18. The gas produced during respiration.
- 19. The star that is the primary source of energy for Earth.
Down
- 1. Gas that human need to breathe.
- 2. The process of transferring pollen to the stigma of flowers.
- 4. The basic unit in the human body.
- 6. A bright light caused by electrical discharge in the atmosphere.
- 7. An eco-friendly energy source such as solar energy.
- 9. Animals that live on land and in water.
- 10. A tool used to see small objects such as cells.
- 12. The organ in the human body that pumps blood.
- 16. The process of water turning into gas.