What is the name for water scarcity that occurs when precipitation is lower than normal,and evaporation is higher than normal? 

A)  water stress 
B)  aridity 
C)  desiccation 
D)  drought

Water Scarcity

A situation in which the available water resources are insufficient to meet the demands of a region.

Precipitation

Any form of water - liquid or solid - falling from the atmosphere to the Earth's surface, including rain, snow, sleet, and hail.

Evaporation

The process by which water transforms from a liquid to a gas or vapor state, often driven by heat from the sun, playing a critical role in the water cycle.