Geology

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Across
  1. 2. It's gravity keeps asteroids from Earth
  2. 6. Earth's crust is made of these divisions
  3. 8. The father of Geology
  4. 9. "The lesser light to rule the night"
  5. 11. The thinnest layer of the Earth
  6. 12. This is the bottom layer of the Earth's crust
  7. 13. Geologists use these to create seismic waves
  8. 15. Would be a part of historical geology
  9. 16. Worldwide during Noah's time
  10. 19. The Earth's orbit can be described as this
  11. 21. Divided into tectonic plates
Down
  1. 1. Geologists that study earthquakes
  2. 3. Occupies highest percentage of Earth's volume
  3. 4. The Earth's Core is contained mostly of this
  4. 5. The study of the Earth
  5. 7. Compared to other moons our moon is...
  6. 9. The Earth's atmosphere protects us from these
  7. 10. A renewable resource
  8. 14. Earth's seasons are caused because of this
  9. 17. The Earth's Core material
  10. 18. What the moon's gravity causes
  11. 20. This is a biological natural resource