What do you know?

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Across
  1. 1. what is a group of lions called
  2. 3. what is the largest organ on the human body
  3. 8. what are the colors of the stars on the American flag
  4. 10. how many chambers are there in a human heart
  5. 11. what is something you hit with a hammer
  6. 13. how many colors are there in the rainbow
  7. 14. what do caterpillars turn into
  8. 18. what is the hardest natural substance found on earth
  9. 20. what is a baby owl called
  10. 22. what is a group of crows called
  11. 23. what do you measure with a thermometer
  12. 24. our solar system is part of which galaxy
  13. 25. what is the color of an emerald
  14. 27. what’s the name of a place that you go to see lots of animals
Down
  1. 2. how many sides does a octagon have
  2. 4. who discovered gravity
  3. 5. how many inches are there in a foot
  4. 6. what is a female elephant called
  5. 7. which Disney movie is Elsa in
  6. 9. which direction does the sun rise from
  7. 12. which month have 28 days
  8. 15. who gifted the Statue of Liberty to the U.S.
  9. 16. how many zeros are there in a million
  10. 17. which vehicle can travel underwater
  11. 19. where was the Aztec empire located
  12. 21. how many wheels does a tricycle have
  13. 26. what color is ruby