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Erosion is the washing away of the uppermost part of the earth crust. Once erosion starts it only gets worse because, erosion wash away further soil, causing the eroding channel to futher expand, increasing the erosion.
Lack of vegetative cover allows erosion which washes away soil nutrients, further worsening the soil against soil vegetative cover.
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Places on hills are unsafe during thunderstorm as there are more chances of landslide. Also lightning tends to strike the highest point. As hills are at highest point so lightning tends to strike here and also there are chances that hills could turn into water run offs and steam too during thunderstorm. So all these makes hilly areas unsafe during thunderstorm .