BASICALLY, ENNAKU GENERAL KNOWLEDGE ROMBA ATHIGAM

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Across
  1. 5. Famous physicist who developed the theory of relativity
  2. 6. A polygon with eight sides
  3. 8. Element with atomic number 6
  4. 9. The process of taking legal action
  5. 11. Inventor of the telephone
  6. 12. The largest planet in our solar system
  7. 14. The Greek god of the sea
  8. 15. A scientist who studies the stars and other objects in the sky
  9. 16. The speed of light in vacuum, in m/s
  10. 20. The capital of Canada
  11. 21. The longest river in the world
Down
  1. 1. A shape with five sides
  2. 2. The powerhouse of the cell
  3. 3. The smallest unit of life
  4. 4. Renowned English playwright
  5. 7. The study of human societies and cultures
  6. 10. A large-scale systematic plan or arrangement for attaining some particular object or goal
  7. 13. Author of "1984"
  8. 17. Capital of Japan
  9. 18. The force that attracts a body toward the center of the earth
  10. 19. VINCI The painter of the Mona Lisa