Chemistry
Sulphur dioxide present in the industrial chimney exhaust causes

Reduction in plant's productivity owing to acid rain
Respiratory and lung disease
Corrosion building materials
All of these

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Chemistry
Water cycle refers to

An integrated attempt to recycle water in relatively arid regions
Constant movement of water from ocean to land and back to ocean once again
Scientific management of water in areas excessively plagued with water-logging
Water distribution in relatively dry areas

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