Fairly Obscure

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Across
  1. 2. The 'C' in 'PVC'
  2. 4. To take away
  3. 6. A measure of energy
  4. 7. English denonym for the people of Denmark
  5. 8. Giving off light
  6. 9. The science of reasoning
  7. 11. Fear or strangers
  8. 14. Alfred Nobel's first invention
  9. 15. World's largest rodent
  10. 17. Rarest & second - densest metal in the Earth's crust
  11. 18. Edward who invented the vaccine
  12. 19. A little bit of Britain next to Spain
  13. 20. What pencil 'lead' is made from
  14. 21. Most popular Malaysian Highlands
  15. 25. The human soul or essence
  16. 26. The first 'A' in 'NASA'
  17. 27. Hot pepper type
  18. 29. A segment of a tortoise-shell
Down
  1. 1. 'Twilight of the gods' (opera)
  2. 3. Study of weather
  3. 5. Famous British Queen
  4. 10. One of R. Montgomery's most popular songs: Mr. ________
  5. 12. Anise-flavoured spirit
  6. 13. Ancient Egyptian writing system
  7. 15. A Polish hamster
  8. 16. Earhart's profession
  9. 22. Relevant to: synonym
  10. 23. Directly below
  11. 24. A deep shade or green
  12. 28. 'Shift + 8'