Science Crossword

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