Across
- 1. in a line
- 5. someone who studies
- 6. relating to the nucleus of an atom
- 7. shaped like a rectangle
- 9. the nature of discipline
- 11. modern
- 13. consisting of molecules
- 15. spoken description of the action
- 19. for free
- 20. from the sun
Down
- 2. with angles
- 3. the words which make up a language
- 4. traditional
- 8. in addition to classwork
- 10. the stuff of fantasy
- 12. a warning
- 14. average
- 16. essential
- 17. not alike, different
- 18. passed on through genetics