GENERAL CROSSWORD

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Across
  1. 3. The capital of Japan. (5)
  2. 5. The longest river in the world. (4)
  3. 6. An eight-sided polygon. (7)
  4. 9. The capital of Australia. (8)
  5. 11. The planet known as the "Red Planet." (4)
  6. 12. The scientific study of life. (7)
  7. 13. A group of stars, gas, and dust held together by gravity. (6)
  8. 14. A large, flat, elevated area of land. (8)
  9. 16. The process of water evaporating from plants. (13)
  10. 17. The collective term for the bones of the human body. (8)
  11. 20. A measure of how hot or cold something is. (11)
Down
  1. 1. The largest organ in the human body. (4)
  2. 2. A form of government in which power is held by the people. (9)
  3. 4. A device used to see very distant objects. (9)
  4. 7. The force that pulls objects toward the center of the Earth. (7)
  5. 8. The process by which plants make their own food. (14)
  6. 10. The chemical symbol for gold. (2)
  7. 15. The layer of the atmosphere closest to Earth. (11)
  8. 18. A word that describes a noun. (9)
  9. 19. The process of breaking down food into simpler substances. (9)