What Causes a Drought?

Answer

The main cause for drought is lack of enough rain. However, there are some other factors that contribute to this such as human activities that include over farming, excessive irrigation, deforestation and erosion.
Q&A Related to "What Causes a Drought"
It have been due to high ocean temperature,dry wind from 1931 to 1939.
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"The north polar jet stream is an air current several hundred kilometres wide, travelling eastwards around the hemisphere. It functions as a barrier, separating the cold, wet
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Droughts are caused by a depletion of precipitation over time. Unlike a dry spell, prolonged lack of rain will cause regions around the world to slowly dry out. Because of the slow
http://weather.about.com/od/drought/f/droughts.htm
Drought can be caused by too little precipitation (rain and snow) over an extended period, as most people assume, but drought can also be caused by increased demand for the available
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4 Additional Answers
A drought refers to an extended period of months or years when a region has a deficiency in its water supply whether surface or underground water. Droughts are generally caused by lack of rainfall or precipitation over a period of time. Other causes include when winds shift air masses and warm, dry, continental air moves over an area as opposed to cooler, moist, oceanic air masses. Human activity can also directly trigger exacerbating factors such as over farming, excessive irrigation, deforestation and erosion which adversely impact the ability of the land to capture and hold water.
Drought is an extended period of months or years when a region notes deficiency in water supply. It is caused when rainfall related to the amount of water vapour in the atmosphere is reduced.
A drought is a very serious consequence due to a lack of precipitation. When there is no precipitation over a long period of time a drought will occur.
A drought is caused by a lack of rain. The lack of rain has to be continuous over a part of time. A drought can cause crops to dry and affect other things that require natural water. You can find more information here: http://library.thinkquest.org/C003603/english/droughts/causesofdroughts.shtml
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