List conditions under which combustion can take place.
Burning of wood and coal causes __________ of air.
A liquid fuel, used in homes is __________
Fuel must be heated to its __________ before it starts burning.
Fire produced by oil cannot be controlled by ___________ .
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Water is poured on burning wood to extinguish fire because water absorbs large amount of heat and the temperature of wood falls below its ignition temperature and fire is blown out.