Scientific Discoveries and Inventions 7

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Across
  1. 3. "The visible surface layer of the sun."
  2. 7. "A technique that uses electric current to drive chemical reactions."
  3. 8. "The process of change in rocks due to heat, pressure, or chemical reactions."
  4. 10. "A device for measuring properties of light over a specific portion of the spectrum."
  5. 13. "A method to stimulate immunity against specific diseases."
  6. 16. "Atoms of the same element with different numbers of neutrons."
  7. 18. "The rigid outer layer of Earth, including the crust and upper mantle."
  8. 19. "A very bright and distant active galactic nucleus."
  9. 20. "The production of light by living organisms, like fireflies."
Down
  1. 1. "A device that uses rotation to separate substances of different densities."
  2. 2. "The chemical process that combines small molecules into long chains."
  3. 4. "A measure of disorder or randomness in a system."
  4. 5. "A type of electromagnetic radiation with wavelengths shorter than visible light."
  5. 6. "A planet located outside our solar system."
  6. 9. "An instrument used to detect radiation."
  7. 11. "The green pigment in plants that captures sunlight for photosynthesis."
  8. 12. "The study of Earth’s crust movements and their effects, like earthquakes."
  9. 14. "The science of designing and building aircraft."
  10. 15. "A large ecosystem characterized by specific climate and species."
  11. 17. "The process where a substance changes from solid to gas without becoming liquid."