The puzzle

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Across
  1. 2. something that you have to follow
  2. 4. something that Vincent Van Gogh made
  3. 7. if you give away something but get something in return
  4. 9. something you create that no one else has before
  5. 12. the temperature
  6. 13. something you do when you have a pencil
Down
  1. 1. it is where something is
  2. 2. the head of a civilization
  3. 3. a big 3d triangle in the ground that is old
  4. 5. it contains a large group of people
  5. 6. a currency
  6. 8. you can do experiments and stuff
  7. 10. something you do on a specific day a lot
  8. 11. something that you can wear that is pretty