The Earth

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Across
  1. 3. That's what you study if you're very interested in the Earth
  2. 4. They can be open or closed or isolated
  3. 5. Includes metamorphism, erosion and melting
  4. 7. It's formed by all living organisms
  5. 10. The singer of Queen
  6. 13. Includes the hydrosphere, the atmosphere and the lithosphere
  7. 15. When geology... goes back through history
  8. 16. All the water on Earth, in all physical states, is called like that
  9. 18. That's what you study if you want to know more about eruptions
  10. 19. The study of climate
  11. 20. The study of the movement, distribution, and quality of salt water on Earth
Down
  1. 1. A blend of gases that envelops and protects the Earth
  2. 2. A system of food chains
  3. 6. The rocky, external layer of the Earth
  4. 8. It's made up of never ending exchanges of water
  5. 9. It's about the movement of plates
  6. 11. That's what you are passionate about if you want to study earthquakes
  7. 12. The scientific study of the weather
  8. 14. The study of the movement, distribution, and quality of fresh water on Earth
  9. 17. The 44th President of the USA