How to start a fire without matches on lighter

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Across
  1. 4. Burnt wood used for fire starting.
  2. 6. Material that catches the spark.
  3. 7. Glass that focuses sunlight.
  4. 9. Method using the sun's rays.
  5. 10. Emergency fire starter.
  6. 12. Friction fire technique.
  7. 13. Material for tinder when fluffed.
Down
  1. 1. Small sticks to start the flame.
  2. 2. Tree whose bark can be used as tinder.
  3. 3. Tool for friction fire.
  4. 4. Wax that can ignite kindling.
  5. 5. Wooden surface for friction fires.
  6. 8. Tool to create sparks.
  7. 10. Rock used to spark.
  8. 11. Friction-based fire-starting.