Quick

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Across
  1. 3. It goes Quack
  2. 6. About 70% of the surface is water
  3. 8. The red planet
  4. 10. Full of holes but holds water
  5. 11. A bird that cant fly and lives in the cold
  6. 12. Pie and Radius twice
  7. 16. The witch of the sand
  8. 17. Rhymes with Baboon
  9. 18. It has hands but cannot clap
  10. 19. Need this to unlock the door
Down
  1. 1. The theme of a book
  2. 2. Has a neck but no head
  3. 4. The food of Minions
  4. 5. You are one of these
  5. 7. It fell onto Sir Isaac Newton
  6. 9. Famous planter known for its distinctive rings
  7. 11. A writing tool with lead
  8. 13. Heads or Tails
  9. 14. The big fluffy things in the sky
  10. 15. It comes in a pair and for cold feet