Answer:
B. Inadequate Pest control
E. Contamination by oil.
Explanation:
Soil can be unhealthy if it is not properly cared. There is requirement for pest control, if they are controlled pest can harm the crops growth. The crops can be dirty and deteriorated even before its growth if pesticides growth is not controlled. Another big reason for soil contamination is dumping of solid toxic wastes by industries into the land. These toxic wastes contaminate soil and the crop growth is then not possible there. Petroleum hydrocarbons can also effect soil health.
