What cause fire?(20分!!!)

1. Electrical Wiring, Electrical Outlets and Faulty Wiring
2. Heating
3. Short out
4. Children Playing with Matches
5. Unattended Stoves
6. Leaving a curling iron on, an electric blanket, or a dropped cigarette or an electric heater too close to flammable material.

Remember, every fire uses up oxygen and releases a lot of carbon dioxide.

1.natural: thunder lighting, hot and dry atmosphere, sun radiation.
2.man made: household fire, smoking, intensionally set fire, industrial accidents, wars.