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