15. Complete the crossword Fig. with the help of the clues :
Across
Down
1. Non-metal which catches 2. A chemical process in which
fire if exposed to air (10) a substance reacts with
oxygen to give off heat. (10)
3. The lowest temperature at 4. Petrol is used as a
which a substance catches in automobiles. (4)
fire is called its
temperature. (8)
5. The most common fire 6. It is as hard as stone and
extinguisher. (5)
black in colour. (4)
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please give me the cross word so that i could give the answer
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