"There Will Come Soft Rains" - Puzzle

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Across
  1. 1. a morning meal
  2. 4. a heat source that depends on oxygen
  3. 9. a shadow or dark appearance of someone or something
  4. 10. a special room designed for young children
  5. 12. the leftovers of something that has collapsed or been demolished.
Down
  1. 2. automatic man-made machine
  2. 3. something singled out or having no one left
  3. 4. a different time period which is yet to come
  4. 5. possibly dangerous wave of energy
  5. 6. the absence of something or nothingness
  6. 7. an announced reminder or alert
  7. 8. a living space
  8. 11. liquid from the sky