Science Crossword

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Across
  1. 6. Potassium nitrate is used in.
  2. 9. The closest planet to the Sun.
  3. 11. Process of taking in food and using it for growth
  4. 16. The blue planet
  5. 17. The first calculating device
  6. 18. Organ of the body that produces the fluid known as bile
  7. 19. The gas usually filled in an electric bulb.
  8. 20. The hardest substance available on earth
Down
  1. 1. The force holding us to the Earth.
  2. 2. Scientist who introduced the idea of evolution
  3. 3. Planet closest in size to Earth
  4. 4. Fungi are plants that lack
  5. 5. Another name for your voice box
  6. 7. Animals that eat both plants and animals.
  7. 8. The element common to all acids.
  8. 10. Microprocessors are used in.
  9. 12. Botany is the study of
  10. 13. Used to make pencil lead
  11. 14. What substance are nails made of
  12. 15. A large blood vessel that carries blood away from the heart