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Fill in the blanks. Burning of wood and coal causes___________ of air.

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__________ .

Answers (1)
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(a) Burning of wood and coal causes pollution of air.
(b) A liquid fuel, used in homes is LPG(Liquified 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 .

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