The soil may absorb hazardous chemicals due to leakage or purposeful usage. For example, mines might let their waste products spill out including heavy metals. They should contain all of these or else the nearby population could develop fatal diseases. Clean-up can take a long time and cost a great deal of money. Soil pollution may also occur due to the use of dangerous pesticides. Although these can kill insects that feed on crops, they also cause long-term damage to the land.