Which of the following is not a major source of groundwater pollution? a. sewage b. compost c. pesticides d. industrial chemicals

B. compost

Explanation:

All other option are major source of ground water pollution except compost. Sewage is one major ground water contaminants especially in Africa where drainage are poorly constructed, managed and channeled. In Africa, because of ignorance people channel there sewage closer to where they constructed their boreholes leading to severe ground water contamination.

On the other hand, pesticides and industrial chemicals are major causes of ground water pollutant in developed nations . They use farm chemicals such as herbicide, fertilizers, pesticides for mechanized farming . This chemicals overtime mix with rain water and seep into the ground to contaminate ground water.

Compost is the biological decomposition of organic waste such as food, plants and animal remains .  it is easily biodegradable. In fact indirectly , compost can reduce ground water pollution if human can use more of it for farming instead of fertilizers.