30 - Secas
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A drought is a period of abnormal water shortage. A meteorological drought is when there is a drop in rainfall, and an agricultural drought is when soil moisture drops abnormally, affecting crop production. A mega-drought is a persistent and widespread drought that lasts much longer than normal (usually a decade or more). Lack of rainfall and evaporation from the ground are the causes of droughts, as well as soil erosion.
1Cause
3Consequences
2Other possible causes
Heatwaves can cause droughts. They often go together.
Deforestation can be the direct cause of droughts because trees stock a lot of water. If they are cut down, they no longer play their part as humidity regulators.