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a) Certain human activities are responsi...

a) Certain human activities are responsible for global warming. Write one such activity.
b) Why is `CO_2` used in fire extinguishers?
c) Write one process of forming `CO_2` in earth.

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a) Increase in the number of factories, increase in the different types of motor vechicles indicriminate deforestation.
b) .CO_2. is one and a half times denser than air and can displace air. It will not catch fire. Hece it is used for fire fighting. When .CO_2. is released from the jet, it forms a sheet like layer and hence does not allow to spread fire.
c) Plants decay and compress into coal, which when combustion turns to .CO_2..
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  12. Which is the crystalline allotrope of carbon ?

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