Incredible Comparisons Crossword

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Across
  1. 5. The biggest animal in the world
  2. 6. The tallest waterfall in the world
  3. 7. The very first plane
  4. 8. How many hours does a human sleep
  5. 9. The fastest land animal
  6. 10. The tallest mountain in the world
Down
  1. 1. The slowest animal in the world
  2. 2. The fastest bird in the world
  3. 3. The fastest fish in the world
  4. 4. The biggest shark