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Across
  1. 2. largest animal
  2. 5. light scatterer
  3. 8. mixture of atoms
  4. 9. salty water
  5. 10. black and white bear
  6. 11. moving air
  7. 14. breathing organ for a fish
  8. 15. science of living things
  9. 18. a test in science
  10. 19. force holding us on earth
  11. 20. big bird movement
  12. 22. nutrient carrier of the body
  13. 23. erupting mountain
Down
  1. 1. swimmer with a big tusk
  2. 3. spotted big cat
  3. 4. animal which bears its young live
  4. 6. vibrations for ears
  5. 7. science of rocks
  6. 12. general weather trend
  7. 13. record of life in rocks
  8. 16. science of reaction of elements
  9. 17. measures temperature
  10. 21. gas cloud in space