Solar System, Earth, and Life Crossword Puzzle

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Across
  1. 3. The thickest layer of Earth
  2. 5. 1 of the 3 qualities unique to human beings
  3. 6. The thinnest layer of planet earth
  4. 8. The Milky Way
  5. 9. All water on Earth belongs to this sphere
  6. 11. the number of oceans on planet Earth
  7. 12. The number of planets in our solar system
  8. 15. The number of animal kingdoms (vertebrates)
Down
  1. 1. The number of continents on planet Earth
  2. 2. The closest planet to our sun
  3. 4. The number of spheres of Earth
  4. 5. This sphere deals with rocks, soil
  5. 7. Needed for all life to exist on Earth
  6. 10. this sphere is unique to Earth
  7. 13. the number of planets between Earth and Sun
  8. 14. The first animal kingdom to appear on Earth