Environmental Puzzle

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Across
  1. 1. Group of whales (3 letters)
  2. 4. largest Rain-Forest In The World. (6 letters)
  3. 7. tallest mammal (7 letters)
  4. 9. Renewable Source Of Energy (3 letters)
  5. 11. Largest Religion In The World. (12 letters)
  6. 13. Country Without Any River (11 letters)
  7. 14. Metal That Never Erodes (4 letters)
  8. 15. Largest Country. (6 letters)
  9. 17. Only Liquid Metal (7 letters)
  10. 18. Study of Thunder (10 letters)
  11. 19. Study Of Weather Patterns For Long (7 letters)
  12. 21. Biggest Mountain In The World. (7 letters)
  13. 23. Only Continent Without Active Volcano (9 letters)
  14. 24. Largest River In The World. ( 4 letters)
  15. 25. Man made structure Used to harness hydroelectric power (3 letters)
  16. 26. Rarest Colour Of Diamonds (5 letters)
  17. 28. A true island state (6 letters)
Down
  1. 2. Layer of the atmosphere protects us from the sun's most harmful rays. (5 letters)
  2. 3. Gas Common For Pollution. ( 14 letters)
  3. 5. Largest Automobile Plant In the World (7 letters)
  4. 6. World's Smallest Country (11 letters)
  5. 8. Continent Without Reptiles & Snakes (10 letters)
  6. 10. First Country to Get To Mars (5 letters)
  7. 11. Group Of Rhinos (5 letters)
  8. 12. First Woman On The Moon (9 letters)
  9. 16. Only Bird Capable of Flying Backwards (7 letters)
  10. 19. Smallest Dog Specie (9 letters)
  11. 20. Softest Mineral (4 letters)
  12. 22. Cleanest City In The World. (7 letters)
  13. 27. Black Liquid Used as Fuel When Refined. (3 letters)