Tunguska Fireball and Transcontinental RR

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Across
  1. 2. offer an idea
  2. 5. across a continent
  3. 8. a streak of fire made by a meteoroid
  4. 9. in addition
  5. 11. earth
  6. 12. an underground passage
  7. 14. uncovered
  8. 15. concept, idea
  9. 17. far from everything
  10. 19. strings to set off an explosive device
  11. 20. an area of high, flat land
Down
  1. 1. a sudden and violent outbreak
  2. 3. trembled or vibrated
  3. 4. dangerous
  4. 6. having lots of light
  5. 7. to hang or swing loosely
  6. 10. severely disfigured or damaged
  7. 13. described
  8. 16. a source of danger
  9. 18. location, place
  10. 19. level; even