Source: Van der Leeden et al., _The Water Encyclopedia,_ 2nd
ed., (Chelsea, Mich.:Lewis Publishers, 1990). Defined scientifically, drought is not lack of rain. It is a dry soil condition in which plant growth slows or stops and plant survival may be threatened. The earth loses water when wind blows, when sun shines, when air temperature is high, and when humidity is low. Of all these factors, air temperature most affects soil moisture loss.
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