Science

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Across
  1. 3. The organ that pumps blood throughout the body
  2. 7. The liquid state of water when it reaches 100°C
  3. 8. A scientist who studies living organisms
  4. 9. The scientist who developed the theory of relativity
  5. 11. The largest planet in the Solar System
  6. 13. The planet known as the "Red Planet"
  7. 15. The type of energy produced by the Sun
  8. 17. The force that pulls objects toward the Earth
  9. 19. The powerhouse of the cell
  10. 20. The gas that humans breathe in to survive
Down
  1. 1. The process by which plants make their own food using sunlight
  2. 2. The layer of gases surrounding the Earth
  3. 4. The smallest unit of an element
  4. 5. The basic unit of life in all living organisms
  5. 6. A metal that is liquid at room temperature
  6. 10. A device used to measure temperature
  7. 12. The center of an atom, containing protons and neutrons
  8. 14. The process by which water turns into vapor
  9. 16. The hardest natural substance on Earth
  10. 18. The study of matter and energy