Round 6 Crossword

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Across
  1. 3. A force that pulls objects toward Earth (7)
  2. 7. The chemical symbol for gold
  3. 9. Largest planet in our solar system
  4. 11. A triangle with all equal sides
  5. 12. A polygon with 8 sides
  6. 13. The longest bone in the human body
  7. 14. The study of matter and energy
Down
  1. 1. The powerhouse of the cell
  2. 2. The largest ocean
  3. 4. The process of liquid turning to gas
  4. 5. Process by which plants make food
  5. 6. Author of Harry Potter
  6. 8. Speed = distance ÷ ___
  7. 10. Device used to input text
  8. 15. The currency used in Japan