Which term refers to water scarcity that occurs when the soil dries up as a result of deforestation or overgrazing? 

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

Water Scarcity

The condition where the availability of water resources is insufficient to meet the demands of a region's population.

Dessication

the process of drying out or dehydrating, often leading to the death of plants and animals in an ecosystem.

Deforestation

The large-scale removal of trees from forests or jungles, often to clear land for agricultural, residential or commercial development.