Across
- 3. The scientist who is famous for discovering penicillin.
- 5. The inventor commonly associated with the practical electric light bulb.
- 6. The force that pulls objects toward Earth.
- 7. The process by which green plants make their own food using sunlight.
- 11. The natural satellite that orbits Earth.
- 12. The scientist who is famous for developing the theory of relativity.
- 13. The scientist who studied gravity and the laws of motion.
- 14. The planet known as the Red Planet.
- 15. The largest planet in our Solar System.
- 16. The scientist who discovered radioactivity and won Nobel Prizes for her work.
Down
- 1. The scientist who developed the theory of evolution by natural selection.
- 2. The device used to look at very small objects, such as cells.
- 4. A scientist who studies rocks, Earth's structure, and Earth's history.
- 8. The gas that humans need to breathe.
- 9. The star at the center of our Solar System.
- 10. The instrument used to measure temperature.