One of Each Length

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Across
  1. 3. Heartbeat measuring device
  2. 5. Echinoderm or chordate
  3. 6. The smell of rain
  4. 8. Cave salamander
  5. 9. Carbon's outer shell
  6. 10. Controversial COVID cure
  7. 14. Triple conjunction
  8. 16. A form of verse
  9. 17. Early name for oxygen: _ air
  10. 18. Rare glassy metamorphic rock
  11. 19. Teflon
  12. 20. Long words
Down
  1. 1. Common explosive
  2. 2. Painkiller
  3. 4. Similar to a mattock
  4. 7. Volcanic
  5. 11. Evangelical cooperation
  6. 12. Antidisestablishmentarianism in practice
  7. 13. Emotional center
  8. 14. Machining scraps
  9. 15. Satisfaction in others' misfortune