Colours and numbers

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123456789101112131415161718
Across
  1. 1. 6
  2. 2. The sky is
  3. 3. 10
  4. 4. Tomatoes are
  5. 6. 5
  6. 8. The sun is
  7. 10. Pigs are
  8. 11. 8
  9. 14. 0
  10. 15. 1
  11. 16. 4
  12. 17. Mice are
  13. 18. Amethyst is
Down
  1. 1. 7
  2. 3. 3
  3. 5. 9
  4. 7. Coal is
  5. 9. Snow is
  6. 12. Grass is
  7. 13. 2
  8. 15. Oranges are