Complete the crossword Fig. 6.1 with the help of the clues:


Across


1. Non-metal which catches fire if exposed to air (10) oxygen to give off heat. (10)


3. The lowest temperature at which a substance catches fire is called its __________temperature. (8)


5. The most common fire extinguisher. (5)


Down


2. A chemical process in which a substance reacts with


4. Petrol is used as a __________ in automobiles. (4)


6. It is as hard as stone and black in color. (4)


Across:


1.Phosphorous – It catches fire in the presence of oxygen.


3.Ignition


5.Water – It can help extinguish fires. It is easily available.


Down:


2.Combustion


4. Fuel


5. Coal


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