1. Drought It is a long period of insufficient availability of water which affects a certain region. In this way, the neccesities of biotic elements can´t be satisfied. They can be seasonal, permanent or cyclical. They can happen in arid, semiarid or humid areas.

2. Causes  Change in the global climate  Limited rains  Shift in river flows  Excesive water extraction  Bad agricultural practice

3. Most important consequences No potable water Population mortality Hungry people Economic losses Ground deterioration

4. Recent Recent examples in Argentina North  Drought of the North (1987)  “Drought of the Century” (1988- eight provincies were affected )  Drought in Tartagal, Salta (November 2004) By Agustin Melsa and Leandro Merelas