Parts of our World

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Across
  1. 2. particles closely packed together in a regular arrangement
  2. 5. Change of state from liquid to solid
  3. 7. The temperature scale where 0° is absolute zero
  4. 9. particles not closely packed
  5. 14. Change of state from gas to liquid
  6. 15. A subatomic particle with a positive charge
  7. 16. A subatomic particle with a neutral charge
  8. 17. Change of state from liquid to gas
  9. 19. The regions of the surface and atmosphere of the earth or another planet occupied by living organisms.
Down
  1. 1. A subatomic particle with a negative charge
  2. 3. Two or more elements, or compounds not chemically combined
  3. 4. Change of state from solid to liquid
  4. 6. A substance containing only one type of atom
  5. 8. The rigid outer part of the earth, consisting of the crust and upper mantle.
  6. 10. Change of state from solid to gas
  7. 11. particles closely packed together in a random arrangement
  8. 12. A layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity
  9. 13. The total amount of water on a planet
  10. 14. Two or more element chemically combined
  11. 18. The basic unit of all matter