water pollution, What do you call the result of human activities that cause the contamination of the water., silts, What are those that are carried by running water as fine sand, clay or other materials., oil spills, The leakage of petroleum onto the surface of a large body of water, sewage, They are waste water and excrement conveyed from sewers, human activities, What is the number one reason of water pollution?

GRADE 2 - WEEK 17

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