Across
- 4. - distance light travels in one year
- 8. - study of matter and its interactions
- 10. - basic unit of life
- 11. - organism that makes its own food using sunlight
- 12. - device used to see small objects often used in labs
- 13. - star at the center of our solar system
- 14. - gas necessary for respiration
Down
- 1. - branch of science that studies living organisms
- 2. - solid, liquid or gas fundamental states of matter
- 3. - force that pulls objects towards earth
- 5. - process by which plants make their own food
- 6. - force that opposes motion between 2 surfaces
- 7. - type of energy generated by movement
- 9. - colorless, odorless gas that forms about 78% of the earth's atmosphere
- 12. - hot molten rock beneath earth's surface
- 15. - basic chemical substance with a specific number of protons