Droughts

A drought is an abnormally long dry period, when there is below-average rainfall in a particular region. It primarily affects agriculture, as there may not be enough water to irrigate crops. it can also lead to the loss of vegetation and livestock, and can cause soil erosion. If the ground becomes too dry, the grass crunches and loses its green color. In addition, droughts can take a toll on farmers, who rely on harvesting crops for their living. Droughts do this by taking away from the water that the crops need to grow. As a result of all of this crop failure happens. Droughts can also severely damage the ecosystem killing wildlife that may live in the area of the drought. Droughts commonly happen in deserts. 

Source: National Geographic