Chemistry
The depletion of Ozone layer is mainly due to

Aviation fuels
Volcanic eruptions
Chlorofluorocarbons
Radioactive rays

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Chemistry
Water cycle refers to

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
An integrated attempt to recycle water in relatively arid regions

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