
Aridification is the process of a region becoming increasingly dry. It refers to long term change rather than seasonal variation. It is often measured as the reduction of average soil moisture content. It can be caused by natural or anthropogenic means such as climate change, reduced precipitation, increased evaporation, lowering of water tables o...
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http://en.wikipedia.org/wiki/Aridification

the process by which a humid region becomes increasingly dry, as by climatic change or human interference with the ecology. Cf. desertification.
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https://www.infoplease.com/dictionary/aridification
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