Common roots

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Across
  1. 2. to touch tact, tang
  2. 3. alone sol
  3. 6. vac empty
  4. 10. new neo
  5. 11. heart cardi
  6. 14. to know/ learn sci
  7. 16. guide/ rule reg
  8. 18. well/ good bene
Down
  1. 1. light luc, lum
  2. 4. self ego
  3. 5. mind/ soul psych
  4. 7. madness mania
  5. 8. give/ gift don, donat
  6. 9. terr land
  7. 12. no/ deny neg
  8. 13. true ver
  9. 15. nature phys
  10. 17. born nate, nat