Chemistry
The mass number of a nucleus is

the sum of the number of protons and neutrons present in the nucleus
always more than the atomic weight
always less than its atomic number
a fraction

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Chemistry
Water cycle refers to

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
Water distribution in relatively dry areas

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