Which of the following is NOT a primary source of water pollution?

Industrial effluents
Agricultural runoff
Natural erosion
Sewage discharge

Environment & Ecology

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Answer:

Option C: Natural erosion

Detailed Solution:

The correct answer is “Natural erosion”.

While natural erosion can contribute to water pollution, it is not considered a primary source compared to industrial effluents, agricultural runoff, and sewage discharge, which are directly related to human activities.