All Fall Down

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Across
  1. 3. Much larger rock
  2. 4. Coal source
  3. 6. Large hill
  4. 7. Rhyming verses
  5. 9. Personal connections
  6. 13. Non biological
  7. 14. Library Items
  8. 15. Kind of tree that isn't wood
  9. 16. Letter sign off
  10. 17. Avalanche without snow
  11. 19. Teacher's workplace
Down
  1. 1. Duty
  2. 2. Winter shower
  3. 4. Dots and dashes
  4. 5. A long car on tracks
  5. 6. Folk tale
  6. 8. Instrument with hammers
  7. 10. Used in monopoly
  8. 11. Type of opera
  9. 12. Book with lock
  10. 18. Under the weather