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 ____________.
(a) Burning of wodd and cooal causes pollution of air.
(b) A liquid fuel used in homes is LPG (liquefied petroleum gas)
(c) Fuel must be heated to its ignition temperature before it starts burning.
(d) Fire produced by oil cannot be controlled by water.