Wildfires

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Across
  1. 3. Fire that advances quickly across the tree canopy
  2. 4. Cold, dense air mass that can blow wildfires out of control
  3. 7. A fire that happened in 1871 in Wisconsin and burned down over 1 million acres
  4. 10. The type of materials like mud and sand that prevent fires
Down
  1. 1. Large uncontrolled fires in the nature
  2. 2. Fire on the ground, normally on dry vegetation that can cause wildfires
  3. 5. Fire picked up by the wind and blown around
  4. 6. Human-made controlled fire used generally for cooking or warmth, might cause wildfire
  5. 8. Fire in forests that contains both crown and surface fires
  6. 9. How free of pollution the air is