Crossword puzzle

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Across
  1. 4. largest desert in the world
  2. 5. - study of heredity
  3. 6. device for splitting light into spectrum
  4. 9. unit of electric current
  5. 10. continent with the most countries
  6. 12. gas used in photosynthesi
Down
  1. 1. the author of Oliver Twist
  2. 2. - force that pulls objects towards earth
  3. 3. - founder of the Mauryan Empire
  4. 7. capital of France
  5. 8. - hardest natural substance on earth
  6. 11. smallest prime number