unit 4 key terms

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Across
  1. 5. can be used to mean"basic"
  2. 7. equal to "therefore"
  3. 9. somebody who studies physics
  4. 10. a confusing problem
  5. 12. academic results about something
  6. 13. a series of connected links which are made of metal
  7. 14. can be used to describe the earth
Down
  1. 1. a subject needs knowledge of math and physics
  2. 2. not good for something
  3. 3. no longer exist
  4. 4. means vapour, a layer of gases surrounding a planet
  5. 6. not violent
  6. 8. science about living things
  7. 11. means "difference"