Which of the following is NOT a source of soil pollution?
Pesticides and herbicides
Industrial waste
Agricultural runoff
Underground water
Soil pollution refers to the contamination of soil with substances that are harmful to plant, animal, and human life. Pesticides, herbicides, industrial waste, and agricultural runoff are some of the common sources of soil pollution. Underground water is not a direct source of soil pollution, but contaminated water can cause soil pollution when it seeps into the ground and contaminates the soil.