The Earth

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Across
  1. 5. The rocky, external layer of the Earth
  2. 7. A system of food chains
  3. 11. The scientific study of the weather
  4. 12. A blend of gases that envelops and protects the Earth
  5. 14. When geology... goes back through history
  6. 16. That's what you study if you want to know more about eruptions
  7. 18. That's what you are passionate about if you want to study earthquakes
Down
  1. 1. Includes metamorphism, erosion and melting
  2. 2. It's formed by all living organisms
  3. 3. The study of the movement, distribution, and quality of salt water on Earth
  4. 4. Includes the hydrosphere, the atmosphere and the lithosphere
  5. 6. The study of the movement, distribution, and quality of fresh water on Earth
  6. 8. The study of climate
  7. 9. It's about the movement of plates
  8. 10. It's made up of neverending exchanges of water
  9. 13. All the water on Earth, in all physical states, is called like that
  10. 15. That's what you study if you're very interested in the Earth
  11. 17. They can be open or closed or isolated