Chemistry
Sulphur dioxide level in the atmosphere can be reduced by using

Static electricity to attract it in factory chimneys
Low - sulphur fuels
Catalytic converters in industry
More efficient car engines

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Chemistry
The Latin word formica means ant. The name formic acid is derived from this Latin word because

this acid, in ancient times, was used to eliminate ant-hills
this acid was first obtained by the distillation of ants
ants are attracted by the odour of this acid
this corrosive acid is secreted by ants to drive away their enemies

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