Chemistry
Water cycle refers to

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

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Chemistry
The mass number of a nucleus is

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

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