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