unit 7d

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Across
  1. 4. - having been turned into stone
  2. 8. - to employ somebody for a short time
  3. 10. - to spread over an area
  4. 12. - at the centre of sth
  5. 13. - in the shape of a pyramid
  6. 15. - the area of buildings in a city between roads
  7. 19. - part of the body from a prehistoric animal
  8. 20. - somebody who does sth for pleasure
Down
  1. 1. - sth that is added to sth else
  2. 2. - to change into sth different
  3. 3. - somebody who studies rocks
  4. 5. - the central stem of a tree
  5. 6. - to exhibit
  6. 7. - one of the kind
  7. 9. - impressions made by animal nails
  8. 11. - a natural material made of minerals
  9. 14. - to show
  10. 16. - outside, not inside
  11. 17. - all of something
  12. 18. - an object made out of stone, wood by an artist