Arid zone
This may be defined as
The zone for which mean annual rainfall is less than 15 inches is called as arid zone.
Or
The zone which is excessively dry and having insufficient rainfall to support agriculture.
Semi arid zone
This zone may be defined as
The zone in which the mean annual rainfall is in the range of 15-30 inches is called as semi arid zone.
Humid zone
Humid zone may be defined as
The zone in which the mean annual rainfall is more than 30 inches is known as humid zone.
Or
The zone which is characterized by appreciable moisture is known as humid zone.
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