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Across
  1. 3. Dense collection of trees
  2. 4. Large predatory fish
  3. 7. Earth's natural satellite
  4. 11. Arc of colors seen in the sky
  5. 12. Bird of prey
  6. 13. Fastest land animal
  7. 14. Large landform that rises prominently
  8. 16. Large mass of ice
  9. 17. Eight-legged arachnid
  10. 20. Large body of salt water
Down
  1. 1. Insect that produces honey
  2. 2. Intelligent marine mammal
  3. 5. Large natural stream of water
  4. 6. Large ape
  5. 8. Star at the center of our solar system
  6. 9. Largest marine mammal
  7. 10. Mountain that erupts lava
  8. 15. Large striped feline
  9. 18. Flightless bird of the Antarctic
  10. 19. Arid region with little rainfall