EUREKA

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Across
  1. 2. Brightest star in the night sky
  2. 6. Tool for hitting nails
  3. 7. Main gas in Earth's atmosphere
  4. 10. Largest ocean on Earth
  5. 11. Largest mammal on Earth
  6. 13. What you do to a book
  7. 17. Fastest land animal
  8. 18. Author of "Romeo and Juliet"
  9. 19. Organ that pumps blood
Down
  1. 1. Instrument with black and white keys
  2. 2. Planet known for its rings
  3. 3. Season after winter
  4. 4. Yellow sour fruit
  5. 5. Opposite of "night"
  6. 8. Building where you watch movies
  7. 9. King of the Jungle
  8. 12. Capital of France
  9. 14. Frozen water
  10. 15. Opposite of "give"
  11. 16. Liquid needed to survive