Crossword for homework

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Across
  1. 2. the scientific study of the behaviour
  2. 3. the total distance around a shape
  3. 6. the study of origin words and how they have changed
  4. 7. used to check temperature
  5. 10. the study of the earth including rocks and the way the Earth changes
  6. 13. used to change the temperature in a house or building
  7. 15. A tool used to track the speed of cars
  8. 18. an account of that person written by that person
  9. 19. The telescope that is used on a submarine
  10. 20. Used to keep food hot
  11. 21. a tool that measures air pressure
  12. 22. the study of living organisms
Down
  1. 1. the true story of a person's life written by someone else other than that person
  2. 4. One of the most common and big units of measurement (Length)
  3. 5. Something that is related to heat or was/is caused by heat
  4. 8. Small unit of measurement, length
  5. 9. The study of Earths physical features
  6. 11. is used to see thing from far away
  7. 12. used to things up close (Particles and germs)
  8. 14. The internal heat of the earth
  9. 16. the shape/line that travels around a shape or object
  10. 17. a collection of ancient stories