Earth day crossword!!!

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Across
  1. 2. every organism on earth needs this liquid to survive
  2. 5. The first layer of the earth
  3. 7. Makes up 71% of earth
  4. 11. CO2 and other types of human waste that destroy the earth
  5. 12. The third layer of earth
  6. 13. The second layer of the earth
  7. 14. The fourth layer of earth
  8. 15. We breath this in
Down
  1. 1. Another word for natural
  2. 3. to protect or save
  3. 4. One of the layers of our atmosphere
  4. 6. Third planet from the sun
  5. 8. There are seven of these landmasses on earth
  6. 9. The opposite of artificial
  7. 10. A florist sells these