pollution - harmful or poisonous substances in the natural environment, cause - a thing that makes an action, chemical - a substance consisting of matter, contaminate - damage or destroy another thing, soil - the upper layer of earth in which plants grow, groundwater - water held underground in the soil or rock crevices, effect - a change as a result of an action or cause, biodegradable - describes a substance that can easily break down naturally, non-biodegradable - does not decay (decompose) quickly or easily,

Pollution vocabulary

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