Chemistry
High concentration hydrocarbon pollutants in atmospheric air causes

Silicosis
Cancer
Reduced crop yield
Respiratory diseases (e.g.asthma)

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Chemistry
Water cycle refers to

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

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