Chemistry
Aquaregia is a mixture of the following in the ratio 1 : 3 by volume

Conc. HNO3 and conc. HCl
Dil. HCl and dil. HNO3
Conc. HCl and conc. HNO3
Conc. HNO3 and conc. H2SO4

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Chemistry
Water cycle refers to

Water distribution in relatively dry areas
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
An integrated attempt to recycle water in relatively arid regions

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