Here's why:

* Efflorescence is the process where dissolved salts in water crystallize and form a white, powdery deposit on the surface of soil, rock, or other materials.

* Arid soils are prone to efflorescence because they have high evaporation rates, leading to the concentration of salts near the surface.

Other terms related to salts in soil:

* Salinity: Refers to the total amount of dissolved salts in the soil.

* Sodicity: Refers to the amount of sodium in the soil.

Let me know if you have any other questions!