Our debt to the teenager

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Across
  1. 6. a distinguishing characteristic
  2. 7. to isolate,separate
  3. 8. showing concern or kindness
  4. 9. involve,participate
  5. 11. absurd,ridiculous
  6. 13. causing death
Down
  1. 1. soft white material around neurons
  2. 2. a case for a blade
  3. 3. lack of proper caution
  4. 4. to grow vigorously
  5. 5. contradictory to common sense and yet true
  6. 6. very tough
  7. 10. difficult to do
  8. 12. to empty of a principal substance
  9. 14. adjustable