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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) Burning of wood and coal causes __pollution__ of air.
(b) A liquid fuel, used in homes is _LPG_.
(c) Fuel must be heated to its __ignition temperature__before it starts burning.
(d) Fire produced by oil cannot be controlled by __water__.