question_answer 2)

Fill in the blanks. (a) Burning of wood and coal causes ............. of air. (b) A liquid fuel, used in homes is.............. . (c) Fuel must be heated to its ................. ............ before it starts burning. (d) Fire produced by oil cannot be controlled by................  

Answer:

(a) pollution (b) kerosene (c) ignition temperature (d) water