Science

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Across
  1. 2. a person who uses science knowledge to design something order to solve a problem
  2. 3. the solid part of Earth
  3. 4. vapor water in the form of a gas
  4. 6. different substances
  5. 7. reaction the process in which substances change
  6. 9. water that has been used and now contains harmful
  7. 11. a supply of something that is useful
  8. 12. the air that surrounds the Earth
  9. 13. all of the living things on Earth
Down
  1. 1. process of a gas turning into a liquid
  2. 5. process of a liquid turning into a gas
  3. 8. all of the liquid water and ice on Earth
  4. 10. a group of parts that work together